Chronic obstructive pulmonary disease
From Wikipedia the free encyclopedia
|Chronic obstructive pulmonary disease|
|Other names||Chronic obstructive lung disease (COLD), chronic obstructive airway disease (COAD)|
|Section of a lung showing centrilobular emphysema, with enlarged airspaces in the centre of a lobule usually caused by smoking and a major feature of COPD|
|Symptoms||Shortness of breath, chronic cough|
|Complications||Anxiety, depression, pulmonary heart disease, pneumothorax|
|Usual onset||Over 35 years old|
|Causes||Tobacco smoking, air pollution, genetics|
|Differential diagnosis||Asthma, congestive heart failure, bronchiectasis, tuberculosis, obliterative bronchiolitis, diffuse panbronchiolitis|
|Prevention||Stopping smoking, improving indoor and outdoor air quality, tobacco control measures|
|Treatment||Pulmonary rehabilitation, long-term oxygen therapy, lung volume reduction|
|Medication||Inhaled bronchodilators and steroids|
|Frequency||174.5 million (2015)|
|Deaths||3.2 million (2019)|
Chronic obstructive pulmonary disease (COPD) is a type of obstructive lung disease characterized by long-term respiratory symptoms and airflow limitation. The main symptoms include shortness of breath and a cough which may or may not produce mucus. COPD progressively worsens with everyday activities such as walking or dressing becoming difficult.
The two most common conditions of COPD are emphysema and chronic bronchitis, and they have been the two classic COPD phenotypes. Emphysema is defined as enlarged airspaces (alveoli) whose walls break down resulting in permanent damage to the lung tissue. Chronic bronchitis is defined as a productive cough that is present for at least three months each year for two years. Both of these conditions can exist without airflow limitation when they are not classed as COPD. Emphysema is just one of the structural abnormalities that can limit airflow and can exist without airflow limitation in a significant number of people. Chronic bronchitis does not always result in airflow limitation but in young adults who smoke the risk of developing COPD is high. Many definitions of COPD in the past included emphysema, and chronic bronchitis but these have never been included in GOLD report definitions.
The most common cause of COPD is tobacco smoking, other risk factors include indoor and outdoor pollution and genetics. In developing countries, common sources of indoor air pollution are the use of biomass fuels such as wood and dry dung fuel for cooking and heating. Most people living in European cities are exposed to damaging levels of air pollution. A number of occupations and associated substances including cadmium dust or fumes, and dust from grains that promote respiratory symptoms has been published in the UK. Long-term exposure to any of these irritants causes an inflammatory response in the lungs, resulting in narrowing of the small airways and breakdown of lung tissue. The diagnosis is based on poor airflow as measured by spirometry.
Most cases of COPD can be prevented by reducing exposure to risk factors such as smoking and indoor and outdoor pollutants. While treatment can slow worsening, there is no conclusive evidence that any medications can change the long-term decline in lung function. COPD treatments include smoking cessation, vaccinations, pulmonary rehabilitation, inhaled bronchodilators, and corticosteroids. Some people may benefit from long-term oxygen therapy, lung volume reduction (surgical) or (bronchoscopic), and lung transplantation. In those who have periods of acute worsening, increased use of medications, antibiotics, corticosteroids, and hospitalization may be needed.
As of 2015, COPD affected about 174.5 million people (2.4% of the global population). It typically occurs in males and females over the age of 35–40. In 2019 it caused 3.2 million deaths, 80% occurring in lower and middle income countries, up from 2.4 million deaths in 1990. The number of deaths is projected to increase further because of continued exposure to risk factors and an aging population. In the US in 2010 the economic cost was put at 32.1 billion US dollars, and projected to rise to 49 billion dollars in 2020. In the UK this cost is estimated at £3.8 billion annually.
Signs and symptoms
Shortness of breath
A cardinal symptom of COPD is the chronic and progressive shortness of breath which is most characteristic of the condition. Shortness of breath (breathlessness) is often the most distressing symptom. Typically, the shortness of breath is worse on prolonged exertion, and worsens over time. In the advanced stages, or end stage pulmonary disease, it occurs during rest and may be always present. Shortness of breath is a source of both anxiety and a poor quality of life in those with COPD. Symptoms of wheezing, and chest tightness associated with breathlessness can be variable over the course of a day or between days, and are not always present. Chest tightness often follows exertion. Many people with more advanced COPD breathe through pursed lips, which can improve shortness of breath. Shortness of breath is often responsible for reduced physical activity, and low levels of physical activity are associated with worse outcomes. In severe and very severe cases there may be constant tiredness, weight loss, muscle loss, and anorexia.
The most often first symptom of COPD is a chronic cough, which may or may not be productive of mucus as phlegm. An accompanying productive cough is only seen in up to 30% of cases. Sometimes limited airflow may develop in the absence of a cough. Symptoms are usually worse in the morning. When a cough persists for more than three months each year for at least two years, in combination with mucus production and without another explanation, it is by definition chronic bronchitis. Chronic bronchitis can occur before the restricted airflow diagnostic of COPD. The amount of phlegm coughed up as sputum can be intermittent. Some people with COPD attribute the symptoms to a smoker's cough. Sputum may be swallowed or spat out, depending often on social and cultural factors and is therefore difficult to evaluate. In severe COPD, vigorous coughing may lead to rib fractures or to a brief loss of consciousness. People with COPD often have increased breathlessness and frequent colds before seeking treatment.
An acute exacerbation is a sudden worsening of signs and symptoms such as increased breathlessness, fast breathing, a fast heart rate, sweating, active use of muscles in the neck, a bluish tinge to the skin, and confusion or combative behavior in very severe exacerbations. The usual cause of an exacerbation is a respiratory tract infection. Such infections can be bacterial or viral or even a combination, with the most common being the common cold virus. Infections appear to be the cause of 50 to 75% of cases, with bacteria in 30%, viruses in up to 50%, and both in 25%. Other risks include exposure to tobacco smoke (active and passive), and environmental pollutants – both indoor and outdoor. During the COVID-19 pandemic, hospital admissions for COPD exacerbations sharply decreased which may be attributable to reduction of emissions and cleaner air.
Smoke from wildfires are proving an increasing risk in many parts of the world, and government agencies have published protective advice on their websites. In the US the EPA advises that the use of dust masks do not give protection from the fine particles in wildfire, and instead advise the use of well-fitting particulate masks. This same advice is offered in Canada to the effects of their forest fires. Bushfires in Australia add to the high risk factors for COPD and its worsening for farmers.
Cold temperatures may also play a role, with exacerbations occurring more commonly in winter. Those with more severe underlying disease have more frequent exacerbations: in mild disease 1.8 per year, moderate 2 to 3 per year, and severe 3.4 per year. Those with many exacerbations have a faster rate of deterioration of their lung function. A pulmonary embolism (PE) (blood clot in the arteries of the lungs) can worsen symptoms in those with pre-existing COPD. Signs of a PE in COPD include pleuritic chest pain and heart failure without signs of infection.
COPD often occurs along with a number of other conditions (comorbidities) due in part to shared risk factors. Common comorbidities include cardiovascular disease, skeletal muscle dysfunction, metabolic syndrome, osteoporosis, depression, anxiety, and lung cancer.
Anxiety, depression and muscle wasting are often complications of COPD. Other complications include a reduced quality of life and increased disability, cor pulmonale, frequent chest infections including pneumonia, secondary polycythemia, respiratory failure, pneumothorax, lung cancer, and cachexia (muscle wasting).
Cognitive impairment is common in those with COPD as it is for other lung conditions that affect airflow. Cognitive impairment is associated with the declining ability to cope with the basic activities of daily living.
It is unclear if those with COPD are at greater risk of contracting COVID-19, though if infected they are at risk of hospitalization and developing severe COVID–19. Differentiating COVID-19 symptoms from an exacerbation is difficult; mild prodromal symptoms may delay its recognition and where they include loss of taste or smell COVID-19 is to be suspected.
Many definitions of COPD in the past included chronic bronchitis and emphysema but these have never been included in GOLD report definitions. Emphysema is defined as enlarged airspaces (alveoli) whose walls break down resulting in permanent damage to the lung tissue, and is just one of the structural abnormalities that can limit airflow. The condition can exist without airflow limitation but commonly it does. Chronic bronchitis is defined as a productive cough that is present for at least three months each year for two years but does not always result in airflow limitation although the risk of developing COPD is great. These older definitions grouped the two types as type A and type B. Type A were emphysema types known as pink puffers due to their pink complexion, fast breathing rate, and pursed lips. Type B were chronic bronchitic types referred to as blue bloaters due to low oxygen levels causing a bluish color to the skin and lips, and swollen ankles. This terminology was no longer accepted as useful, as most people with COPD have a combination of both emphysema and airway disease. These are now recognized as the two major phenotypes of COPD – emphysematous phenotype and chronic bronchitic phenotype.
The two classic emphysematous and chronic bronchitic phenotypes are fundamentally different conditions with unique underlying mechanisms. It has since been recognized that COPD is more complex, with a diverse group of disorders of differing risk factors and clinical courses that has resulted in a number of other subtypes or phenotypes of COPD being accepted, and proposed.
The identification and recognition of different phenotypes can guide appropriate treatment approaches. For example the PDE4 inhibitor roflumilast is targeted at the chronic-bronchitic phenotype. Two inflammatory phenotypes show a phenotype stability; the neutrophilic inflammatory phenotype, and the eosinophilic inflammatory phenotype. A pulmonary vascular COPD phenotype has been described due to cardiovascular dysfunction.
The most important risk factor for the development of COPD is tobacco smoke; other factors include exposure to indoor and outdoor pollutants, allergens, and occupational exposure. In Europe airway hyperresponsiveness is rated as the second most important risk factor after smoking. COPD develops from the inflammatory effects of toxic factors and their interaction with a number of host factors. Host factors include a genetic susceptibility, factors associated with poverty, aging and physical inactivity. Asthma and tuberculosis are also recognized as risk factors.
The primary risk factor for COPD globally is tobacco smoking. Of those who smoke, about 20% will get COPD, and of those who are lifelong smokers, about half will get COPD. In the United States and United Kingdom, of those with COPD, 80–95% are either current or previous smokers. The likelihood of developing COPD increases with the number of cigarettes smoked. Several studies indicate that women are more susceptible than men to the harmful effects of tobacco smoke. In non-smokers, exposure to passive smoking (second-hand smoke) is the cause of 1.2 million deaths from the more than 8 million deaths worldwide due to tobacco smoke. Other types of tobacco smoke, such as from cigar, pipe, water-pipe and hookah use, also confer a risk. Water-pipe or hookah smoke appears to be as harmful or even more harmful as smoking cigarettes.
Marijuana is the second most commonly smoked substance, but evidence linking its use to COPD is very limited. Limited evidence shows that marijuana does not accelerate lung function decline. A low use of marijuana gives a bronchodilatory effect rather than the bronchoconstrictive effect from tobacco use, but it is often smoked in combination with tobacco or on its own by tobacco smokers. Higher use however has shown a decline in FEV1. There is evidence of it causing some respiratory problems, and its use in combination may have a cumulative toxic effect suggesting it as a risk factor for spontaneous pneumothorax, bullous emphysema, COPD, and lung cancer. A noted difference between marijuana use and tobacco was that respiratory problems were resolved with stopping usage unlike the continued decline with stopping tobacco smoking. Respiratory symptoms reported with marijuana use included chronic cough, increased sputum production, and wheezing but not shortness of breath. Also these symptoms were typically reported ten years ahead of their affecting tobacco smokers. Another study found that chronic marijuana smokers even with the additional use of tobacco developed similar respiratory problems but did not seem to develop airflow limitation and COPD.
Poorly ventilated cooking fires, often fueled by coal or biomass fuels such as wood and dry dung fuel, lead to indoor air pollution and are one of the most common causes of COPD in developing countries. These fires are a method of cooking and heating for nearly three billion people, with their health effects being greater among women due to greater exposure. They are used as the main source of energy in 80% of homes in India, China and sub-Saharan Africa.
People who live in large cities have a higher rate of COPD compared to people who live in rural areas. While urban air pollution is a contributing factor in exacerbations, its overall role as a cause of COPD is unclear. Areas with poor outdoor air quality, including that from exhaust gas, generally have higher rates of COPD. The overall effect in relation to smoking, however, is believed to be small.
Intense and prolonged exposure to workplace dusts, chemicals, and fumes increases the risk of COPD in both smokers and nonsmokers. A number of occupations and their associated substances including cadmium dust or fumes, and dust from grains that promote respiratory symptoms has been published in the UK. Workplace exposure is believed to be the cause in 10–20% of cases. In the United States, it is believed that it is related to more than 30% of cases among those who have never smoked and probably represents a greater risk in countries without sufficient regulations.
A number of industries and sources have been implicated, including high levels of dust in coal mining, gold mining (and mining in general, due to the common element of rock blasting, materials handling, and crushing), and the cotton textile industry, occupations involving silica and isocyanates, and fumes from welding. Working in agriculture is also a risk. In some professions, the risks have been estimated as equivalent to that of one-half to two packs of cigarettes a day. Silica dust and fiberglass dust exposure can also lead to COPD, with the risk unrelated to that for silicosis. The negative effects of dust exposure and cigarette smoke exposure appear to be additive or possibly synergistic (i.e. more than additive).
Genetics play a role in the development of COPD. It is more common among relatives of those with COPD who smoke than unrelated smokers. Currently, the only clearly inherited risk factor is alpha-1 antitrypsin deficiency. This risk is particularly high if someone deficient in alpha-1 antitrypsin also smokes. It is responsible for about 1–5% of cases and the condition is present in about three to four in 10,000 people. Other genetic factors are being investigated, of which many are likely.
COPD is a type of obstructive lung disease in which chronic, incompletely reversible poor airflow (airflow limitation) and inability to breathe out fully (air trapping) exist. The poor airflow is the result of small airways disease – obstructive bronchiolitis, and emphysema (the breakdown of lung tissue). The relative contributions of these two factors vary between people.
COPD develops as a significant and chronic inflammatory response to inhaled irritants. which ultimately leads to bronchial and alveolar remodelling in the lung. Thus, airway remodelling with narrowing of peripheral airway and emphysema are responsible for the alteration of lung function. The mucociliary clearance is particularly altered with a dysregulation of cilia and mucus production.  Chronic bacterial infections may also add to the inflammatory state. The inflammatory cells involved include neutrophil granulocytes and macrophages, two types of white blood cells. Those who smoke additionally have Tc1 lymphocyte involvement and some people with COPD have eosinophil involvement similar to that in asthma. Part of this cell response is brought on by inflammatory mediators such as chemotactic factors. Other processes involved with lung damage include oxidative stress produced by high concentrations of free radicals in tobacco smoke and released by inflammatory cells, and breakdown of the connective tissue of the lungs by proteases that are insufficiently inhibited by protease inhibitors. The destruction of the connective tissue of the lungs leads to emphysema, which then contributes to the poor airflow, and finally, poor absorption and release of respiratory gases. General muscle wasting that often occurs in COPD may be partly due to inflammatory mediators released by the lungs into the blood.
Narrowing of the airways occurs due to inflammation and scarring within them. This contributes to the inability to breathe out fully. The greatest reduction in air flow occurs when breathing out, as the pressure in the chest is compressing the airways at this time. This can result in more air from the previous breath remaining within the lungs when the next breath is started, resulting in an increase in the total volume of air in the lungs at any given time, a process called hyperinflation or air trapping. Hyperinflation from exercise is linked to shortness of breath in COPD, as breathing in is less comfortable when the lungs are already partly filled. Hyperinflation may also worsen during an exacerbation.
Low oxygen levels, and eventually, high carbon dioxide levels in the blood, can occur from poor gas exchange due to decreased ventilation from airway obstruction, hyperinflation, and a reduced desire to breathe. During exacerbations, airway inflammation is also increased, resulting in increased hyperinflation, reduced expiratory airflow, and worsening of gas transfer. This can also lead to insufficient ventilation, and eventually low blood oxygen levels. Low oxygen levels, if present for a prolonged period, can result in narrowing of the arteries in the lungs, while emphysema leads to the breakdown of capillaries in the lungs.
Both of these changes result in increased blood pressure in the arteries of the lungs, which may cause secondary right-sided heart failure also known as cor pulmonale. This leads to symptoms of leg swelling and bulging neck veins. Cor pulmonale has become less common since the use of supplemental oxygen.
The diagnosis of COPD should be considered in anyone over the age of 35 to 40 who has shortness of breath, a chronic cough, sputum production, or frequent winter colds and a history of exposure to risk factors for the disease. Spirometry is then used to confirm the diagnosis.
Spirometry measures the amount of airflow obstruction present and is generally carried out after the use of a bronchodilator, a medication to open up the airways. Two main components are measured to make the diagnosis, the forced expiratory volume in one second FEV1, which is the greatest volume of air that can be breathed out in the first second of a breath, and the forced vital capacity (FVC), which is the greatest volume of air that can be breathed out in a single large breath. Normally, 75–80% of the FVC comes out in the first second and a FEV1/FVC ratio less than 70% in someone with symptoms of COPD defines a person as having the disease. Based on these measurements, spirometry would lead to over-diagnosis of COPD in the elderly. The National Institute for Health and Care Excellence criteria additionally require a FEV1 less than 80% of predicted. People with COPD also exhibit a decrease in diffusing capacity of the lung for carbon monoxide (DLCO) due to decreased surface area in the alveoli, as well as damage to the capillary bed. Testing the peak expiratory flow (the maximum speed of expiration), commonly used in asthma diagnosis, is not sufficient for the diagnosis of COPD.
|1||Only strenuous activity|
|3||With normal walking|
|4||After a few minutes of walking|
|5||With changing clothing|
|Severity||FEV1 % predicted|
|Mild (GOLD 1)||≥80|
|Moderate (GOLD 2)||50–79|
|Severe (GOLD 3)||30–49|
|Very severe (GOLD 4)||<30|
A number of methods can be used to assess the affects and severity of COPD. The MRC breathlessness scale or the COPD assessment test (CAT) are simple questionnaires that may be used. GOLD refers to a modified MRC scale that if used, needs to include other tests since it is simply a test of breathlessness experienced. Scores on CAT range from 0–40 with the higher the score, the more severe the disease. Spirometry may help to determine the severity of airflow limitation. This is typically based on the FEV1 expressed as a percentage of the predicted "normal" for the person's age, gender, height, and weight. Both the American and European guidelines recommend partly basing treatment recommendations on the FEV1. The GOLD guidelines group people into four categories based on symptoms assessment, degree of airflow limitation, and history of exacerbations. Weight loss, muscle loss, and fatigue are seen in severe and very severe cases.
A chest X-ray is not useful to establish a diagnosis of COPD but it is of use in either excluding other conditions or including comorbidities such as pulmonary fibrosis, and bronchiectasis. Characteristic signs of COPD on X-ray include hyperinflation (shown by a flattened diaphragm and an increased retrosternal air space) and lung hyperlucency. A saber-sheath trachea may also be shown that is indicative of COPD.
A CT scan is not routinely used except for the exclusion of bronchiectasis. An analysis of arterial blood is used to determine the need for oxygen supplementation, and assess for high levels of carbon dioxide in the blood; this is recommended in those with an FEV1 less than 35% predicted, those with a peripheral oxygen saturation less than 92%, and those with symptoms of congestive heart failure. In areas of the world where alpha-1 antitrypsin deficiency is common, people with COPD (particularly those below the age of 45 and with emphysema affecting the lower parts of the lungs) should be considered for testing.
COPD may need to be differentiated from other conditions such as congestive heart failure, asthma, bronchiectasis, tuberculosis, obliterative bronchiolitis, and diffuse panbronchiolitis. The distinction between asthma and COPD is made on the basis of the symptoms, smoking history, and whether airflow limitation is reversible with bronchodilators at spirometry. Tuberculosis may also present with a chronic cough and should be considered in locations where it is common. Chronic bronchitis with normal airflow is not classified as COPD.
Most cases of COPD are potentially preventable through decreasing exposure to smoke and improving air quality.
Keeping people from starting smoking is a key aspect of preventing COPD. The policies of governments, public health agencies, and antismoking organizations can reduce smoking rates by discouraging people from starting and encouraging people to stop smoking. Smoking bans in public areas and places of work are important measures to decrease exposure to secondhand smoke, and while many places have instituted bans, more are recommended.
In those who smoke, stopping smoking is the only measure shown to slow down the worsening of COPD. Even at a late stage of the disease, it can reduce the rate of worsening lung function and delay the onset of disability and death. Often, several attempts are required before long-term abstinence is achieved. Attempts over 5 years lead to success in nearly 40% of people.
Some smokers can achieve long-term smoking cessation through willpower alone. Smoking, however, is highly addictive, and many smokers need further support. The chance of quitting is improved with social support, engagement in a smoking cessation program, and the use of medications such as nicotine replacement therapy, bupropion, or varenicline. Combining smoking-cessation medication with behavioral therapy is more than twice as likely to be effective in helping people with COPD stop smoking, compared with behavioral therapy alone.
A number of measures have been taken to reduce the likelihood that workers in at-risk industries—such as coal mining, construction, and stonemasonry—will develop COPD. Examples of these measures include the creation of public policy, education of workers and management about the risks, promoting smoking cessation, checking workers for early signs of COPD, use of respirators, and dust control. Effective dust control can be achieved by improving ventilation, using water sprays and by using mining techniques that minimize dust generation. If a worker develops COPD, further lung damage can be reduced by avoiding ongoing dust exposure, for example by changing their work role.
Both indoor and outdoor air quality can be improved, which may prevent COPD or slow the worsening of existing disease. This may be achieved by public policy efforts, cultural changes, and personal involvement.
Many developed countries have successfully improved outdoor air quality through regulations. This has resulted in improvements in the lung function of their populations. Those with COPD may experience fewer symptoms if they stay indoors on days when outdoor air quality is poor.
In developing countries one key effort is to reduce exposure to smoke from cooking and heating fuels through improved ventilation of homes and better stoves and chimneys. Proper stoves may improve indoor air quality by 85%. Using alternative energy sources such as solar cooking and electrical heating is also effective. Using fuels such as kerosene or coal might be better than traditional biomass such as wood or dung .
COPD is not curable, but the symptoms are treatable and its progression can be delayed. The major goals of management are to reduce exposure to risk factors including offering treatments that help with stopping smoking. Stopping smoking has the greatest potential for slowing the disease progression. Stopping smoking can reduce the rate of lung function decline, and also reduce mortality from smoking-related diseases such as lung cancer and cardiovascular disease. Other recommendations include vaccinations to help reduce the risk of exacerbations, giving advice as to healthy eating, and encouraging physical exercise. Guidance is also advised as to managing breathlessness, and stress. Other illnesses are also managed. An action plan is drawn up and is to be reviewed. Providing people with a personalized action plan, an educational session, and support for use of their action plan in the event of an exacerbation, reduces the number of hospital visits and encourages early treatment of exacerbations. When self-management interventions, such as taking corticosteroids and using supplemental oxygen, is combined with action plans, health-related quality of life is improved compared to usual care. In those with COPD who are malnourished, supplementation with vitamin C, vitamin E, zinc, and selenium can improve weight, strength of respiratory muscles, and health-related quality of life.
In those with advanced disease, palliative care may reduce symptoms, with morphine improving the feelings of shortness of breath. Noninvasive ventilation may be used to support breathing.
Corticosteroids by mouth improve the chance of recovery and decrease the overall duration of symptoms. They work equally well as intravenous steroids but appear to have fewer side effects. Five days of steroids work as well as ten or fourteen. In those with a severe exacerbation, antibiotics improve outcomes. A number of different antibiotics may be used including amoxicillin, doxycycline and azithromycin; whether one is better than the others is unclear. There is no clear evidence of improved outcomes for those with less severe cases. The FDA recommends against the use of fluoroquinolones when other options are available due to higher risks of serious side effects. For people with type 2 respiratory failure (acutely raised CO
2 levels) bilevel positive airway pressure (BPAP) decreases the probability of death or the need of intensive care admission. Fewer than 20% of exacerbations require hospital admission. In those without acidosis from respiratory failure, home care ("hospital at home") may be able to help avoid some admissions.
Inhaled short-acting bronchodilators are the primary medications used on an as needed basis; their use on a regular basis is not recommended. The two major types are beta2-adrenergic agonists and anticholinergics; either in long-acting or short-acting forms. Beta2–adrenergic agonists target receptors in the smooth muscle cells in bronchioles causing them to relax and allow improved airflow. They reduce shortness of breath, tend to reduce dynamic hyperinflation, and improve exercise tolerance. Short acting bronchodilators have an effect over four hours, and for maintenance therapy long acting bronchodilators with an effect of over twelve hours are used. In times of more severe symptoms a short acting agent may be used in combination. If long-acting bronchodilators become insufficient, then inhaled corticosteroids are typically added.
Which type of long-acting agent, long-acting muscarinic antagonist (LAMA) such as tiotropium or a long-acting beta agonist (LABA) is better is unclear, and trying each and continuing with the one that works best may be advisable. Both types of agent appear to reduce the risk of acute exacerbations by 15–25%. A 2018 review found the combination of LABA/LAMA may reduce COPD exacerbations and improve quality-of-life compared to long-acting bronchodilators alone. The 2018 NICE guideline recommends use of dual long-acting bronchodilators with economic modelling suggesting that this approach is preferable to starting one long acting bronchodilator and adding another later.
Several short-acting β2 agonists are available, including salbutamol (albuterol) and terbutaline. They provide some relief of symptoms for four to six hours. LABAs such as salmeterol, formoterol, and indacaterol are often used as maintenance therapy. Some feel the evidence of benefits is limited, while others view the evidence of benefit as established. Long-term use appears safe in COPD with adverse effects include shakiness and heart palpitations. When used with inhaled steroids they increase the risk of pneumonia. While steroids and LABAs may work better together, it is unclear if this slight benefit outweighs the increased risks. There is some evidence that combined treatment of LABAs with long-acting muscarinic antagonists (LAMA), an anticholinergic, may result in less exacerbations, less pneumonia, an improvement in forced expiratory volume (FEV1%), and potential improvements in quality of life when compared to treatment with LABA and an inhaled corticosteriod (ICS). All three together, LABA, LAMA, and ICS, have some evidence of benefits. Indacaterol requires an inhaled dose once a day, and is as effective as the other long-acting β2 agonist drugs that require twice-daily dosing for people with stable COPD.
The two main anticholinergics used in COPD are ipratropium and tiotropium. Ipratropium is a short-acting muscarinic antagonist (SAMA), while tiotropium is long-acting. Tiotropium is associated with a decrease in exacerbations and improved quality of life, and tiotropium provides those benefits better than ipratropium. It does not appear to affect mortality or the overall hospitalization rate. Anticholinergics can cause dry mouth and urinary tract symptoms. They are also associated with increased risk of heart disease and stroke. Aclidinium, another long-acting agent, reduces hospitalizations associated with COPD and improves quality of life. The LAMA umeclidinium bromide is another anticholinergic alternative. When compared to tiotropium, the LAMAs aclidinium, glycopyrronium, and umeclidinium appear to have a similar level of efficacy; with all four being more effective than placebo. Further research is needed comparing aclidinium to tiotropium.
Corticosteroids are usually used in inhaled form, but may also be used as tablets to treat acute exacerbations. While inhaled corticosteroids (ICSs) have not shown benefit for people with mild COPD, they decrease acute exacerbations in those with either moderate or severe disease. By themselves, they have no effect on overall one-year mortality. Whether they affect the progression of the disease is unknown. When used in combination with a LABA, they may decrease mortality compared to either ICSs or LABA alone. Inhaled steroids are associated with increased rates of pneumonia. The use of corticosteroids is associated with a decrease in the number of lymphoid follicles (in the bronchial lymphoid tissue).
The 2018 NICE guidelines recommend the use of ICS in people with asthmatic features or features suggesting steroid responsiveness. These include any previous diagnosis of asthma or atopy, a higher blood eosinophil count, substantial variation in FEV1 over time (at least 400 mL), and at least 20% diurnal variation in peak expiratory flow. "Higher" eosinophil count was chosen, rather than specifying a particular value as it is not clear what the precise threshold should be or on how many occasions or over what time period it should be elevated.
Phosphodiesterase-4 inhibitors (PDE4 inhibitors) are anti-inflammatories that improve lung function and reduce exacerbations in moderate to severe illness. Roflumilast is a PDE4 inhibitor used orally once daily to reduce inflammation, it has no direct bronchodilatory effects. It is essentially used in treating those with chronic bronchitis along with systemic corticosteroids. Reported adverse effects of roflumilast appear early in treatment, become less with continued treatment, and are reversible. One effect is dramatic weight loss and its use is to be avoided in underweight people. It is also advised to be used with caution in those suffering from depression.
Long-term antibiotics, specifically those from the macrolide class such as erythromycin, reduce the frequency of exacerbations in those who have two or more a year. This practice may be cost effective in some areas of the world. Concerns include the potential for antibiotic resistance and side effects including hearing loss, tinnitus, and changes to the heart rhythm (long QT syndrome). Annual influenza vaccinations in those with COPD reduce exacerbations, hospitalizations and death. Pneumococcal vaccination may also be beneficial. A review of an oral Haemophilus influenzae vaccine found 1.6 exacerbations per year as opposed to a baseline of 2.1 in those with COPD. This small reduction was not deemed significant.
Methylxanthines such as theophylline are widely used. Theophylline is seen to have a mild bronchodilatory effect in stable COPD. Inspiratory muscle function is seen to be improved but the causal effect is unclear. Theophylline is seen to improve breathlessness when used as an add-on to salmeterol. All instances of improvement have been reported using sustained release preparations.  Methylxanthines are not recommended for use in exacerbations due to adverse effects.
Mucolytics may help to reduce exacerbations in some people with chronic bronchitis; noticed by less hospitalization and less days of disability in one month. Erdosteine is recommended by NICE. GOLD also supports the use of some mucolytics that are advised against when inhaled corticosteroids are being used, and singles out erdosteine as having good effects regardless of corticosteroid use. Erdosteine also has antioxidant properties but there is not enough evidence to support the general use of antioxidants. Erdosteine has been shown to significantly reduce the risk of exacerbations, shorten their duration, and hospital stays.
Supplemental oxygen is recommended for those with low oxygen levels in respiratory failure at rest (a partial pressure of oxygen less than 50–55 mmHg or oxygen saturations of less than 88%). When taking into account complications including cor pulmonale and pulmonary hypertension, the levels involved are 56–59 mmHg. Oxygen therapy is to be used for between 15 and 18 hours per day and is said to decrease the risk of heart failure and death. In those with normal or mildly low oxygen levels, oxygen supplementation (ambulatory) may improve shortness of breath when given during exercise, but may not improve breathlessness during normal daily activities or affect the quality of life. During acute exacerbations, many require oxygen therapy; the use of high concentrations of oxygen without taking into account a person's oxygen saturations may lead to increased levels of carbon dioxide and worsened outcomes. In those at high risk of high carbon dioxide levels, oxygen saturations of 88–92% are recommended, while for those without this risk, recommended levels are 94–98%.
Pulmonary rehabilitation is a program of exercise, disease management, and counseling, coordinated to benefit the individual. A severe exacerbertion leads to hospital admission, high mortality, and a decline in the ability to carry out daily activities. Following a hospital admission pulmonary rehabilitation has been shown to significantly reduce future hospital admissions, mortality, and improve quality of life.
The optimal exercise routine, use of noninvasive ventilation during exercise, and intensity of exercise suggested for people with COPD, is unknown. Performing endurance arm exercises improves arm movement for people with COPD, and may result in a small improvement in breathlessness. Performing arm exercises alone does not appear to improve quality of life. Pursed-lip breathing exercises may be useful. Tai chi exercises appear to be safe to practice for people with COPD, and may be beneficial for pulmonary function and pulmonary capacity when compared to a regular treatment program. Tai Chi was not found to be more effective than other exercise intervention programs. Inspiratory and expiratory muscle training (IMT, EMT) is an effective method for improving activities of daily living (ADL). A combination of IMT and walking exercises at home may help limit breathlessness in cases of severe COPD. Additionally, the use of low amplitude high velocity joint mobilization together with exercise improves lung function and exercise capacity. The goal of spinal manipulation therapy (SMT) is to improve thoracic mobility in an effort to reduce the work on the lungs during respiration, to in turn increase exercise capacity as indicated by the results of a systemic medical review.
Airway clearance techniques (ACTs), such as postural drainage, percussion/vibration, autogenic drainage, hand-held positive expiratory pressure (PEP) devices and other mechanical devices, may reduce the need for increased ventilatory assistance, the duration of ventilatory assistance, and the length of hospital stay in people with acute COPD. In people with stable COPD, ACTs may lead to short-term improvements in health-related quality of life and a reduced long-term need for hospitalisations related to respiratory issues.
Being either underweight or overweight can affect the symptoms, degree of disability, and prognosis of COPD. People with COPD who are underweight can improve their breathing muscle strength by increasing their calorie intake. When combined with regular exercise or a pulmonary rehabilitation program, this can lead to improvements in COPD symptoms. Supplemental nutrition may be useful in those who are malnourished.
Management of exacerbations
People with COPD can experience exacerbations (flare-ups) that are commonly caused by respiratory tract infections. The symptoms that worsen are not specific to COPD and differential diagnoses need to be considered. Acute exacerbations are typically treated by increasing the use of short-acting bronchodilators including a combination of a short-acting inhaled beta agonist and short-acting anticholinergic. These medications can be given either via a metered-dose inhaler with a spacer or via a nebulizer, with both appearing to be equally effective. Nebulization may be easier for those who are more unwell. Oxygen supplementation can be useful. Excessive oxygen; however, can result in increased CO
2 levels and a decreased level of consciousness.
Lung volume reduction
Where there is severe emphysema with significant hyperinflation that has proved unresponsive to other therapies lung volume reduction surgery (LVRS) may be an option. LVRS involves the removal of tissue from a lobe damaged most by emphysema, which allows the rest of the lungs to expand and give improved function. It seems to be particularly effective if emphysema predominantly involves the upper lobe, but the procedure increases the risks of adverse events and early death for people who have diffuse emphysema. In very severe cases lung transplantation might be considered. A CT scan may be useful in surgery considerations. Ventilation/perfusion scintigraphy is another imaging method that may be used to evaluate cases for surgical interventions and also to evaluate post-surgery responses.
Minimally invasive bronchoscopic procedures may be carried out to reduce lung volume. These include the use of valves, coils, or thermal ablation. Endobronchial valves are one-way valves that may be used in those with severe hyperinflation resulting from advanced emphysema; a suitable target lobe, and no collateral ventilation are required for this procedure. The placement of one or more valves in the lobe induces a partial collapse of the lobe that ensures a reduction in residual volume that improves lung function, the capacity for exercise, and quality of life.
Both of these techniques are associated with adverse effects including persistent air leaks and cardiovascular complications. Thermal vapor ablation has an improved profile. Heated water vapor is used to target lobe regions which leads to permanent fibrosis and volume reduction. The procedure is able to target individual lobe segments, can be carried out regardless of collateral ventilation, and can be repeated with the natural advance of emphysema.
COPD is usually progressive and can lead to premature death. It is estimated that 3% of all disability is related to COPD. The proportion of disability from COPD globally has decreased from 1990 to 2010 due to improved indoor air quality primarily in Asia. The overall number of years lived with disability from COPD, however, has increased.
There are many variables affecting the long-term outcome in COPD, and GOLD recommends the use of a composite test (BODE) that includes the main variables of body-mass index, obstruction of airways, dyspnea (breathlessness), and exercise, and not just spirometry results.
NICE recommends against the use of BODE for the prognosis assessment in stable COPD; factors such as exacerbations and frailty need to be considered. Other factors that contribute to a poor outcome include older age, comorbidities such as lung cancer and cardiovascular disease, and the number and severity of exacerbations needing hospital admittance.
Estimates of prevalence have considerable variation due to differences in analytical and surveying approach, and the choice of diagnostic criteria. An estimated 384 million people had COPD in 2010, corresponding to a global prevalence of 12%. The disease affects men and women almost equally, as there has been increased tobacco use among women in the developed world. The increase in the developing world between 1970 and the 2000s is believed to be related to increasing rates of smoking in this region, an increasing population and an aging population due to fewer deaths from other causes such as infectious diseases. Some developed countries have seen increased rates, some have remained stable and some have seen a decrease in COPD prevalence. The global numbers are expected to continue increasing as risk factors remain common and the population continues to get older.
Around three million people die of COPD each year. In some countries, mortality has decreased in men but increased in women. This is most likely due to rates of smoking in women and men becoming more similar. COPD is more common in older people.
In the UK three million people are reported to be affected by COPD – two million of these being undiagnosed. On average the number of COPD-related deaths between 2007 and 2016 was 28,600. The estimated number of deaths due to occupational exposure was estimated to be about 15% at around 4,000. In the United States in 2018 almost 15.7 million people had been diagnosed with COPD, and it is estimated that millions more have not been diagnosed.
In 2011, there were approximately 730,000 hospitalizations in the United States for COPD. Globally COPD in 2019 was the third leading cause of death. In low-income countries COPD does not appear in the top 10 causes of death; in other income groups it is in the top 5.
The name chronic obstructive pulmonary disease is believed to have first been used in 1965. Previously it has been known by a number of different names, including chronic obstructive bronchopulmonary disease, chronic obstructive respiratory disease, chronic airflow obstruction, chronic airflow limitation, chronic obstructive lung disease, nonspecific chronic pulmonary disease, diffuse obstructive pulmonary syndrome, and chronic obstructive airways disease.
The terms emphysema, and chronic bronchitis were formally defined in 1959 at the CIBA guest symposium and in 1962 at the American Thoracic Society Committee meeting on Diagnostic Standards. The word emphysema is derived from the Greek ἐμφυσᾶν emphysan meaning inflate – itself composed of ἐν en, meaning "in", and φυσᾶν physan, meaning "breath, blast". The term chronic bronchitis came into use in 1808 Early descriptions of probable emphysema include: in 1679 by T. Bonet of a condition of "voluminous lungs" and in 1769 by Giovanni Morgagni of lungs which were "turgid particularly from air". In 1721 the first drawings of emphysema were made by Ruysh. These were followed with pictures by Matthew Baillie in 1789 and descriptions of the destructive nature of the condition. In 1814 Charles Badham used catarrh to describe the cough and excess mucus in chronic bronchitis. René Laennec, the physician who invented the stethoscope, used the term emphysema in his book A Treatise on the Diseases of the Chest and of Mediate Auscultation (1837) to describe lungs that did not collapse when he opened the chest during an autopsy. He noted that they did not collapse as usual because they were full of air and the airways were filled with mucus. In 1842, John Hutchinson invented the spirometer, which allowed the measurement of vital capacity of the lungs. However, his spirometer could only measure volume, not airflow. Tiffeneau and Pinelli in 1947 described the principles of measuring airflow.
Air pollution and the increase in cigarette smoking in Great Britain at the start of the 20th century led to high rates of chronic lung disease, though it received little attention until the Great Smog of London in December 1952. This spurred epidemiological research in the United Kingdom, Holland, and elsewhere. In 1953, Dr. George L. Waldbott, an American allergist, first described a new disease he named smoker's respiratory syndrome in the 1953 Journal of the American Medical Association. This was the first association between tobacco smoking and chronic respiratory disease.
Early treatments included garlic, cinnamon and ipecac, among others. Modern treatments were developed during the second half of the 20th century. Evidence supporting the use of steroids in COPD was published in the late 1950s. Bronchodilators came into use in the 1960s following a promising trial of isoprenaline. Further bronchodilators, such as short-acting salbutamol, were developed in the 1970s, and the use of long-acting bronchodilators began in the mid-1990s.
Society and culture
COPD is known colloquially as smoker's lung, but it also occurs in people who have never smoked. People with emphysema have been known as pink puffers or "type A" due to their frequent pink complexion, fast respiratory rate and pursed lips, and people with chronic bronchitis have been referred to as blue bloaters or "type B" due to the often bluish color of the skin and lips from low oxygen levels and their swollen ankles. This terminology is no longer used, as most people with COPD have a combination of both emphysema and airway disease.
It is generally accepted that COPD is widely underdiagnosed, and many people remain untreated. In the US the NIH promoted November as COPD Awareness Month to be an annual focus on increasing awareness of the condition.
Globally, as of 2010, COPD is estimated to result in economic costs of $2.1 trillion, half of which occurring in the developing world. Of this total an estimated $1.9 trillion are direct costs such as medical care, while $0.2 trillion are indirect costs such as missed work. This is expected to more than double by the year 2030. In Europe, COPD represents 3% of healthcare spending. In the United States, costs of the disease are estimated at $50 billion, most of which is due to exacerbation. COPD was among the most expensive conditions seen in U.S. hospitals in 2011, with a total cost of about $5.7 billion.
Several new long-acting agents are under development. Treatment with stem cells is under study. While there is tentative data that it is safe, and the animal data is promising, there is little human data as of 2017. The small amount of human data there is has shown poor results.
A procedure known as targeted lung denervation, which involves decreasing the parasympathetic nervous system supply of the lungs, is being studied but does not have sufficient data to determine its use. The effectiveness of alpha-1 antitrypsin augmentation treatment for people who have alpha-1 antitrypsin deficiency is unclear.
Research continues into the use of telehealthcare to treat people with COPD when they experience episodes of shortness of breath; treating people remotely may reduce the number of emergency-room visits and improve the person's quality of life.
Evidence is growing for the effectiveness of Astaxanthin against lung disease including COPD. Astaxanthin is a potent antioxidant with anti-inflammatory properties, and more trials are said to be needed into its use.
Chronic obstructive pulmonary disease may occur in a number of other animals and may be caused by exposure to tobacco smoke. Most cases of the disease, however, are relatively mild. In horses it is known as recurrent airway obstruction (RAO) or heaves. RAO can be quite severe, and most often is linked to exposure to common allergens. COPD is also commonly found in old dogs.
- "Chronic obstructive pulmonary disease". NICE. Retrieved 5 July 2021.
- "Chronic obstructive pulmonary disease (COPD) - Complications | BMJ Best Practice". bestpractice.bmj.com. Retrieved 11 July 2021.
- "Chronic obstructive pulmonary disease (COPD)". www.who.int. Retrieved 1 July 2021.
- Gold Report 2021, pp. 20-23, Chapter 2: Diagnosis and initial assessment.
- Gold Report 2021, pp. 33–35, Chapter 2: Diagnosis and initial assessment.
- Gold Report 2021, pp. 40–46, Chapter 3: Evidence supporting prevention and maintenance therapy.
- GBD 2015 Disease and Injury Incidence and Prevalence Collaborators (October 2016). "Global, regional, and national incidence, prevalence, and years lived with disability for 310 diseases and injuries, 1990–2015: a systematic analysis for the Global Burden of Disease Study 2015". Lancet. 388 (10053): 1545–1602. doi:10.1016/S0140-6736(16)31678-6. PMC 5055577. PMID 27733282.
- Gold Report 2021, pp. 4–6, Chapter 1: Definition and overview.
- Myc LA, Shim YM, Laubach VE, Dimastromatteo J (April 2019). "Role of medical and molecular imaging in COPD". Clin Transl Med. 8 (1): 12. doi:10.1186/s40169-019-0231-z. PMC 6465368. PMID 30989390.
- "ICD-11 - ICD-11 for Mortality and Morbidity Statistics". icd.who.int. Retrieved 30 June 2021.
- Martini K, Frauenfelder T (November 2020). "Advances in imaging for lung emphysema". Ann Transl Med. 8 (21): 1467. doi:10.21037/atm.2020.04.44. PMC 7723580. PMID 33313212.
- Gold Report 2021, pp. 8–14, Chapter 1: Definition and overview.
- Torres-Duque CA, García-Rodriguez MC, González-García M (August 2016). "Is Chronic Obstructive Pulmonary Disease Caused by Wood Smoke a Different Phenotype or a Different Entity?". Archivos de Bronconeumologia. 52 (8): 425–31. doi:10.1016/j.arbres.2016.04.004. PMID 27207325.
- "Air pollution exposure in cities — European Environment Agency". www.eea.europa.eu. Retrieved 28 June 2021.
- "COPD causes - occupations and substances". www.hse.gov.uk. Retrieved 3 July 2021.
- Rabe KF, Hurd S, Anzueto A, et al. (September 2007). "Global strategy for the diagnosis, management, and prevention of chronic obstructive pulmonary disease: GOLD executive summary". American Journal of Respiratory and Critical Care Medicine. 176 (6): 532–55. doi:10.1164/rccm.200703-456SO. hdl:2066/51740. PMID 17507545. S2CID 20863981.
- Gold Report 2021, p. 82, Chapter 4: Managment of stable COPD.
- Gold Report 2021, pp. 62–65, Chapter 3: Evidence supporting prevention and maintenance therapy.
- Dobler CC, Morrow AS, Beuschel B, et al. (March 2020). "Pharmacologic Therapies in Patients With Exacerbation of Chronic Obstructive Pulmonary Disease: A Systematic Review With Meta-analysis". Annals of Internal Medicine. 172 (6): 413–422. doi:10.7326/M19-3007. PMID 32092762. S2CID 211476101.
- GBD 2015 Mortality and Causes of Death Collaborators (October 2016). "Global, regional, and national life expectancy, all-cause mortality, and cause-specific mortality for 249 causes of death, 1980–2015: a systematic analysis for the Global Burden of Disease Study 2015". Lancet. 388 (10053): 1459–1544. doi:10.1016/S0140-6736(16)31012-1. PMC 5388903. PMID 27733281.
- GBD 2013 Mortality and Causes of Death Collaborators (January 2015). "Global, regional, and national age-sex specific all-cause and cause-specific mortality for 240 causes of death, 1990–2013: a systematic analysis for the Global Burden of Disease Study 2013". Lancet. 385 (9963): 117–71. doi:10.1016/S0140-6736(14)61682-2. PMC 4340604. PMID 25530442.
- "COPD Costs". www.cdc.gov. 5 July 2019.
- "COPD commissioning toolkit" (PDF). www.assets.publishing.service.gov.uk. Retrieved 18 July 2021.
- National Institute for Health and Clinical Excellence. Clinical guideline 101: Chronic Obstructive Pulmonary Disease. London, June 2010.
- Vestbo J (2013). "Diagnosis and Assessment" (PDF). Global Strategy for the Diagnosis, Management, and Prevention of Chronic Obstructive Pulmonary Disease. Global Initiative for Chronic Obstructive Lung Disease. pp. 9–17. Archived from the original (PDF) on 28 March 2016. Retrieved 24 July 2013.
- "What Are the Signs and Symptoms of COPD?". National Heart, Lung, and Blood Institute. July 31, 2013. Archived from the original on November 18, 2013. Retrieved November 29, 2013.
- MedlinePlus Encyclopedia: Chronic obstructive pulmonary disease
- Mayer AF, Karloh M, Dos Santos K, de Araujo CL, Gulart AA (March 2018). "Effects of acute use of pursed-lips breathing during exercise in patients with COPD: a systematic review and meta-analysis". Physiotherapy. 104 (1): 9–17. doi:10.1016/j.physio.2017.08.007. PMID 28969859.
- Gold Report 2021 & pp92–96, Chapter 4: Managment of stable COPD. sfn error: no target: CITEREFGold_Report_2021pp92–96 (help)
- O'Donnell DE, Milne KM, James MD, de Torres JP, Neder JA (January 2020). "Dyspnea in COPD: New Mechanistic Insights and Management Implications". Advances in Therapy. 37 (1): 41–60. doi:10.1007/s12325-019-01128-9. PMC 6979461. PMID 31673990.
- Szalontai K, Gémes N, Furák J, et al. (June 2021). "Chronic Obstructive Pulmonary Disease: Epidemiology, Biomarkers, and Paving the Way to Lung Cancer". J Clin Med. 10 (13). doi:10.3390/jcm10132889. PMC 8268950. PMID 34209651.
- Gruber P (November 2008). "The Acute Presentation of Chronic Obstructive Pulmonary Disease in the Emergency Department: A Challenging Oxymoron". Emergency Medicine Practice. 10 (11). Archived from the original on 2013-10-05.
- Vestbo J, Hurd SS, Agustí AG, et al. (February 2013). "Global strategy for the diagnosis, management, and prevention of chronic obstructive pulmonary disease: GOLD executive summary". American Journal of Respiratory and Critical Care Medicine. 187 (4): 347–65. doi:10.1164/rccm.201204-0596PP. PMID 22878278.
- Dhar R (2011). Textbook of pulmonary and critical care medicine. New Delhi: Jaypee Brothers Medical Publishers. p. 1056. ISBN 978-93-5025-073-0.
- Palange P (2013). ERS Handbook of Respiratory Medicine. European Respiratory Society. p. 194. ISBN 978-1-84984-041-5.
- Short B, Carson S, Devlin AC, et al. (March 2021). "Non-typeable Haemophilus influenzae chronic colonization in chronic obstructive pulmonary disease (COPD)". Critical Reviews in Microbiology. 47 (2): 192–205. doi:10.1080/1040841X.2020.1863330. PMID 33455514.
- Guo-Parke H, Linden D, Weldon S, Kidney JC, Taggart CC (2020). "Mechanisms of Virus-Induced Airway Immunity Dysfunction in the Pathogenesis of COPD Disease, Progression, and Exacerbation". Frontiers in Immunology. 11: 1205. doi:10.3389/fimmu.2020.01205. PMC 7325903. PMID 32655557.
- Lötvall J (2011). "Anti-infective treatments in asthma and COPD (10)". Advances in combination therapy for asthma and COPD. Wiley. p. 251. ISBN 978-1-119-97846-6.
- US EPA, OAR (19 April 2016). "Particulate Matter (PM) Basics". www.epa.gov. Retrieved 21 July 2021.
- Halpin DM, Criner GJ, Papi A, Singh D, Anzueto A, Martinez FJ, Agusti AA, Vogelmeier CF (January 2021). "Global Initiative for the Diagnosis, Management, and Prevention of Chronic Obstructive Lung Disease. The 2020 GOLD Science Committee Report on COVID-19 and Chronic Obstructive Pulmonary Disease". Am J Respir Crit Care Med. 203 (1): 24–36. doi:10.1164/rccm.202009-3533SO. PMC 7781116. PMID 33146552.
- US EPA, OAR (13 August 2019). "Health Effects Attributed to Wildfire Smoke". www.epa.gov. Retrieved 21 July 2021.
- "Forest Fires and Lung Health". the lung association. 25 August 2014. Retrieved 21 July 2021.
- "Bushfire smoke". National Centre for Farmer Health. 19 March 2014. Retrieved 21 July 2021.
- Barnes P (2009). Asthma and COPD : basic mechanisms and clinical management (2nd ed.). Academic. p. 837. ISBN 978-0-12-374001-4.
- Hanania N (2010-12-09). COPD a Guide to Diagnosis and Clinical Management (1st ed.). Springer Science+Business Media, LLC. p. 197. ISBN 978-1-59745-357-8.
- Beasley V, Joshi PV, Singanayagam A, et al. (2012). "Lung microbiology and exacerbations in COPD". International Journal of Chronic Obstructive Pulmonary Disease. 7: 555–69. doi:10.2147/COPD.S28286. PMC 3437812. PMID 22969296.
- Decramer M, Janssens W, Miravitlles M (April 2012). "Chronic obstructive pulmonary disease". Lancet. 379 (9823): 1341–51. CiteSeerX 10.1.1.1000.1967. doi:10.1016/S0140-6736(11)60968-9. PMC 7172377. PMID 22314182.
- Aleva FE, Voets LW, Simons SO, et al. (March 2017). "Prevalence and Localization of Pulmonary Embolism in Unexplained Acute Exacerbations of COPD: A Systematic Review and Meta-analysis". Chest. 151 (3): 544–554. doi:10.1016/j.chest.2016.07.034. PMID 27522956. S2CID 7181799.
- Gold Report 2021, pp. 26-33, Chapter 2: Diagnosis and initial assessment.
- Gold Report 2021, p. 126, Chapter 6: COPD and comorbidities.
- Weinberger, Steven E. (2019). Principles of pulmonary medicine (Seventh ed.). Philadelphia, PA. p. 104. ISBN 9780323523714.
- Des Jardins T (2013). Clinical Manifestations & Assessment of Respiratory Disease (6th ed.). Elsevier Health Sciences. p. 176. ISBN 978-0-323-27749-5.
- Ramírez-Venegas A, Torres-Duque CA, Guzmán-Bouilloud NE, González-García M, Sansores RH (2019). "SMALLa AIRWAY DISEASE IN COPD ASSOCIATED TO BIOMASS EXPOSURE". Rev Invest Clin. 71 (1): 70–78. doi:10.24875/RIC.18002652. PMID 30810542.
- Corlateanu A, Mendez Y, Wang Y, Garnica RJ, Botnaru V, Siafakas N (2020). "Chronic obstructive pulmonary disease and phenotypes: a state-of-the-art". Pulmonology. 26 (2): 95–100. doi:10.1016/j.pulmoe.2019.10.006. PMID 31740261.
- Halpin DM, Miravitlles M, Metzdorf N, Celli B (2017). "Impact and prevention of severe exacerbations of COPD: a review of the evidence". Int J Chron Obstruct Pulmon Dis. 12: 2891–2908. doi:10.2147/COPD.S139470. PMC 5638577. PMID 29062228.
- Brightling C, Greening N (August 2019). "Airway inflammation in COPD: progress to precision medicine". Eur Respir J. 54 (2). doi:10.1183/13993003.00651-2019. PMID 31073084.
- Kumar A, Mahajan A, Salazar EA, et al. (June 2021). "Impact of human immunodeficiency virus on pulmonary vascular disease". Glob Cardiol Sci Pract. 2021 (2): e202112. doi:10.21542/gcsp.2021.12. PMC 8272407. PMID 34285903.
- World Health Organization (2008). WHO Report on the Global Tobacco Epidemic 2008: The MPOWER Package (PDF). World Health Organization. pp. 268–309. ISBN 978-92-4-159628-2. Archived (PDF) from the original on 2013-11-12.
- Ward H (2012). Oxford Handbook of Epidemiology for Clinicians. Oxford University Press. pp. 289–290. ISBN 978-0-19-165478-7.
- Laniado-Laborín R (January 2009). "Smoking and chronic obstructive pulmonary disease (COPD). Parallel epidemics of the 21 century". International Journal of Environmental Research and Public Health. 6 (1): 209–24. doi:10.3390/ijerph6010209. PMC 2672326. PMID 19440278.
- Rennard S (2013). Clinical management of chronic obstructive pulmonary disease (2nd ed.). Informa Healthcare. p. 23. ISBN 978-0-8493-7588-0.
- Sharma A, Barclay J (2010). COPD in primary care. Radcliffe Pub. p. 9. ISBN 978-1-84619-316-3.
- Goldman L (2012). Goldman's Cecil medicine (24th ed.). Elsevier/Saunders. p. 537. ISBN 978-1-4377-1604-7.
- Han MK, Martinez FJ (September 2020). "Host, Gender, and Early-Life Factors as Risks for Chronic Obstructive Pulmonary Disease". Clin Chest Med. 41 (3): 329–337. doi:10.1016/j.ccm.2020.06.009. PMC 7993923. PMID 32800188.
- "Tobacco". www.who.int. Retrieved 12 July 2021.
- Patel, MP; Khangoora, VS; Marik, PE (October 2019). "A Review of the Pulmonary and Health Impacts of Hookah Use". Annals of the American Thoracic Society. 16 (10): 1215–1219. doi:10.1513/AnnalsATS.201902-129CME. PMID 31091965.
- Chatkin JM, Zabert G, Zabert I, Chatkin G, Jiménez-Ruiz CA, de Granda-Orive JI, Buljubasich D, Solano Reina S, Figueiredo A, Ravara S, Riesco Miranda JA, Gratziou C (September 2017). "Lung Disease Associated With Marijuana Use". Arch Bronconeumol. 53 (9): 510–515. doi:10.1016/j.arbres.2017.03.019. PMID 28483343.
- Underner M, Urban T, Perriot J, Peiffer G, Harika-Germaneau G, Jaafari N (December 2018). "[Spontaneous pneumothorax and lung emphysema in cannabis users]". Rev Pneumol Clin (in French). 74 (6): 400–415. doi:10.1016/j.pneumo.2018.06.003. PMID 30420278.
- Martinasek MP, McGrogan JB, Maysonet A (November 2016). "A Systematic Review of the Respiratory Effects of Inhalational Marijuana". Respir Care. 61 (11): 1543–1551. doi:10.4187/respcare.04846. PMID 27507173.
- Ribeiro LI, Ind PW (October 2016). "Effect of cannabis smoking on lung function and respiratory symptoms: a structured literature review". NPJ Prim Care Respir Med. 26: 16071. doi:10.1038/npjpcrm.2016.71. PMC 5072387. PMID 27763599.
- Vestbo J (2013). "Definition and Overview". Global Strategy for the Diagnosis, Management, and Prevention of Chronic Obstructive Pulmonary Disease. American Journal of Respiratory and Critical Care Medicine. 187. Global Initiative for Chronic Obstructive Lung Disease. pp. 1–7. doi:10.1164/rccm.201204-0596PP. PMID 22878278.
- Amaral AF, Strachan DP, Burney PG, Jarvis DL (May 2017). "Female Smokers Are at Greater Risk of Airflow Obstruction Than Male Smokers. UK Biobank" (PDF). American Journal of Respiratory and Critical Care Medicine. 195 (9): 1226–1235. doi:10.1164/rccm.201608-1545OC. hdl:10044/1/45106. PMID 28075609. S2CID 9360093.
- "Access to clean fuels and technologies for cooking". Our World in Data. Retrieved 15 February 2020.
- Kennedy SM, Chambers R, Du W, Dimich-Ward H (December 2007). "Environmental and occupational exposures: do they affect chronic obstructive pulmonary disease differently in women and men?". Proceedings of the American Thoracic Society. 4 (8): 692–4. doi:10.1513/pats.200707-094SD. PMID 18073405.
- Pirozzi C, Scholand MB (July 2012). "Smoking cessation and environmental hygiene". The Medical Clinics of North America. 96 (4): 849–67. doi:10.1016/j.mcna.2012.04.014. PMID 22793948.
- Halbert RJ, Natoli JL, Gano A, et al. (September 2006). "Global burden of COPD: systematic review and meta-analysis". The European Respiratory Journal. 28 (3): 523–32. doi:10.1183/09031936.06.00124605. PMID 16611654.
- Laine C (2009). In the Clinic: Practical Information about Common Health Problems. ACP Press. p. 226. ISBN 978-1-934465-64-6.
- Devereux G (May 2006). "ABC of chronic obstructive pulmonary disease. Definition, epidemiology, and risk factors". BMJ. 332 (7550): 1142–4. doi:10.1136/bmj.332.7550.1142. PMC 1459603. PMID 16690673.
- Barnes PJ, Drazen JM, Rennard SI, Thomson NC, eds. (2009). "Relationship between cigarette smoking and occupational exposures". Asthma and COPD: Basic Mechanisms and Clinical Management. Academic. p. 464. ISBN 978-0-12-374001-4.
- Rushton L (2007). "Chronic obstructive pulmonary disease and occupational exposure to silica". Reviews on Environmental Health. 22 (4): 255–72. doi:10.1515/REVEH.2007.22.4.255. PMID 18351226. S2CID 13486935.
- Hopper T (2014). Mosby's Pharmacy Technician – E-Book: Principles and Practice. Elsevier Health Sciences. p. 610. ISBN 9780323292450.
- Foreman MG, Campos M, Celedón JC (July 2012). "Genes and chronic obstructive pulmonary disease". The Medical Clinics of North America. 96 (4): 699–711. doi:10.1016/j.mcna.2012.02.006. PMC 3399759. PMID 22793939.
- Brode SK, Ling SC, Chapman KR (September 2012). "Alpha-1 antitrypsin deficiency: a commonly overlooked cause of lung disease". CMAJ. 184 (12): 1365–71. doi:10.1503/cmaj.111749. PMC 3447047. PMID 22761482.
- Reilly JJ, Silverman EK, Shapiro SD (2011). "Chronic Obstructive Pulmonary Disease". In Longo D, Fauci A, Kasper D, Hauser S, Jameson J, Loscalzo J (eds.). Harrison's Principles of Internal Medicine (18th ed.). McGraw Hill. pp. 2151–9. ISBN 978-0-07-174889-6.
- Lo Bello F, Ieni A, Hansbro PM, et al. (May 2020). "Role of the mucins in pathogenesis of COPD: implications for therapy". Expert Rev Respir Med. 14 (5): 465–483. doi:10.1080/17476348.2020.1739525. hdl:10453/139160. PMID 32133884.
- Perotin JM, Coraux C, Lagonotte E, et al. (July 2018). "Alteration of primary cilia in COPD". Eur Respir J. 52 (1). doi:10.1183/13993003.00122-2018. PMID 29678947.
- Gohy S, Carlier FM, Fregimilicka C, et al. (November 2019). "Altered generation of ciliated cells in chronic obstructive pulmonary disease". Sci Rep. 9 (1): 17963. doi:10.1038/s41598-019-54292-x. PMC 6884487. PMID 31784664.
- Yang J, Zuo WL, Fukui T, et al. (August 2017). "Smoking-Dependent Distal-to-Proximal Repatterning of the Adult Human Small Airway Epithelium". Am J Respir Crit Care Med. 196 (3): 340–352. doi:10.1164/rccm.201608-1672OC. PMC 5549864. PMID 28345955.
- Calverley PM, Koulouris NG (January 2005). "Flow limitation and dynamic hyperinflation: key concepts in modern respiratory physiology". The European Respiratory Journal. 25 (1): 186–99. doi:10.1183/09031936.04.00113204. PMID 15640341.
- Currie GP (2010). ABC of COPD (2nd ed.). Wiley-Blackwell, BMJ Books. p. 32. ISBN 978-1-4443-2948-3.
- O'Donnell DE (April 2006). "Hyperinflation, dyspnea, and exercise intolerance in chronic obstructive pulmonary disease". Proceedings of the American Thoracic Society. 3 (2): 180–4. doi:10.1513/pats.200508-093DO. PMID 16565429. S2CID 20644418.
- Cooper CB (October 2006). "The connection between chronic obstructive pulmonary disease symptoms and hyperinflation and its impact on exercise and function". The American Journal of Medicine. 119 (10 Suppl 1): 21–31. doi:10.1016/j.amjmed.2006.08.004. PMID 16996896.
- Weitzenblum E, Chaouat A (2009). "Cor pulmonale". Chronic Respiratory Disease. 6 (3): 177–85. doi:10.1177/1479972309104664. PMID 19643833. S2CID 25808105.
- "Cor pulmonale". Professional guide to diseases (9th ed.). Wolters Kluwer Health/Lippincott Williams & Wilkins. 2009. pp. 120–2. ISBN 978-0-7817-7899-2.
- "Chronic obstructive pulmonary disease - NICE Pathways". pathways.nice.org.uk. Retrieved 29 June 2021.
- Qaseem A, Wilt TJ, Weinberger SE, et al. (August 2011). "Diagnosis and management of stable chronic obstructive pulmonary disease: a clinical practice guideline update from the American College of Physicians, American College of Chest Physicians, American Thoracic Society, and European Respiratory Society". Ann Intern Med. 155 (3): 179–91. doi:10.7326/0003-4819-155-3-201108020-00008. PMID 21810710.
- Young VB (2010). Blueprints medicine (5th ed.). Wolters Kluwer Health/Lippincott Williams & Wilkins. p. 69. ISBN 978-0-7817-8870-0.
- Bailey KL (July 2012). "The importance of the assessment of pulmonary function in COPD". The Medical Clinics of North America. 96 (4): 745–52. doi:10.1016/j.mcna.2012.04.011. PMC 3998207. PMID 22793942.
- Williams N (August 2017). "The MRC breathlessness scale". Occup Med (Lond). 67 (6): 496–497. doi:10.1093/occmed/kqx086. PMID 28898975.
- "Chronic obstructive pulmonary disease (COPD) - Criteria | BMJ Best Practice". bestpractice.bmj.com. Retrieved 2 July 2021.
- "COPD Assessment Test (CAT)". American Thoracic Society. Archived from the original on December 3, 2013. Retrieved November 29, 2013.
- Brant WE, Helms CA (2007). Fundamentals of Diagnostic Radiology. Lippincott Williams & Wilkins. p. 513. ISBN 9780781761352.
- Gold Report 2021, p. 35, Chapter 2: Diagnosis and initial assessment.
- BTS COPD Consortium (2005). "Spirometry in practice – a practical guide to using spirometry in primary care". pp. 8–9. Archived from the original on 26 August 2014. Retrieved 25 August 2014.
- Vestbo J (2013). "Introduction" (PDF). Global Strategy for the Diagnosis, Management, and Prevention of Chronic Obstructive Pulmonary Disease. Global Initiative for Chronic Obstructive Lung Disease. xiii–xv. Archived from the original (PDF) on 2013-10-04.
- Policy Recommendations for Smoking Cessation and Treatment of Tobacco Dependence. World Health Organization. 2003. pp. 15–40. ISBN 978-92-4-156240-9. Archived from the original on 2008-09-15.
- Jiménez-Ruiz CA, Fagerström KO (March 2013). "Smoking cessation treatment for COPD smokers: the role of counselling". Monaldi Archives for Chest Disease. 79 (1): 33–7. doi:10.4081/monaldi.2013.107. PMID 23741944.
- "Chronic obstructive pulmonary disease in over 16s: diagnosis and management | Guidance and guidelines | NICE". www.nice.org.uk. Retrieved 2018-06-05.
- Kumar P, Clark M (2005). Clinical Medicine (6th ed.). Elsevier Saunders. pp. 900–1. ISBN 978-0-7020-2763-5.
- Tønnesen P (March 2013). "Smoking cessation and COPD". European Respiratory Review. 22 (127): 37–43. doi:10.1183/09059180.00007212. PMID 23457163.
- "Coping with cravings". nhs.uk. 27 April 2018. Retrieved 15 July 2021.
- van Eerd EA, van der Meer RM, van Schayck OC, Kotz D (August 2016). "Smoking cessation for people with chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews (8): CD010744. doi:10.1002/14651858.CD010744.pub2. PMC 6400424. PMID 27545342.
- Smith BK, Timby NE (2005). Essentials of nursing : care of adults and children. Lippincott Williams & Wilkins. p. 338. ISBN 978-0-7817-5098-1.
- Rom WN, Markowitz SB, eds. (2007). Environmental and occupational medicine (4th ed.). Wolters Kluwer/Lippincott Williams & Wilkins. pp. 521–2. ISBN 978-0-7817-6299-1.
- "Wet cutting". Health and Safety Executive. Archived from the original on December 3, 2013. Retrieved November 29, 2013.
- George RB (2005). Chest medicine : essentials of pulmonary and critical care medicine (5th ed.). Lippincott Williams & Wilkins. p. 172. ISBN 978-0-7817-5273-2.
- Gold Report 2021, pp. 80–83, Chapter 4: Management of stable COPD.
- Howcroft M, Walters EH, Wood-Baker R, Walters JA (December 2016). "Action plans with brief patient education for exacerbations in chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews. 12: CD005074. doi:10.1002/14651858.CD005074.pub4. PMC 6463844. PMID 27990628.
- Lenferink A, Brusse-Keizer M, van der Valk PD, et al. (August 2017). "Self-management interventions including action plans for exacerbations versus usual care in patients with chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews. 8: CD011682. doi:10.1002/14651858.CD011682.pub2. PMC 6483374. PMID 28777450.
- Gold Report 2021, pp. 60–65, Chapter 3: Evidence supporting prevention and maintenance therapy.
- Carlucci A, Guerrieri A, Nava S (December 2012). "Palliative care in COPD patients: is it only an end-of-life issue?". European Respiratory Review. 21 (126): 347–54. doi:10.1183/09059180.00001512. PMID 23204123.
- Wilson ME, Dobler CC, Morrow AS, et al. (February 2020). "Association of Home Noninvasive Positive Pressure Ventilation With Clinical Outcomes in Chronic Obstructive Pulmonary Disease: A Systematic Review and Meta-analysis". JAMA. 323 (5): 455–465. doi:10.1001/jama.2019.22343. PMC 7042860. PMID 32016309.
- Walters JA, Tan DJ, White CJ, Gibson PG, Wood-Baker R, Walters EH (September 2014). "Systemic corticosteroids for acute exacerbations of chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews. 9 (9): CD001288. doi:10.1002/14651858.CD001288.pub4. PMID 25178099.
- Walters JA, Tan DJ, White CJ, Wood-Baker R (March 2018). "Different durations of corticosteroid therapy for exacerbations of chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews. 3: CD006897. doi:10.1002/14651858.CD006897.pub4. PMC 6494402. PMID 29553157.
- Vollenweider DJ, Frei A, Steurer-Stey CA, Garcia-Aymerich J, Puhan MA (October 2018). "Antibiotics for exacerbations of chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews. 10: CD010257. doi:10.1002/14651858.CD010257.pub2. PMC 6517133. PMID 30371937.
- Mackay AJ, Hurst JR (July 2012). "COPD exacerbations: causes, prevention, and treatment". The Medical Clinics of North America. 96 (4): 789–809. doi:10.1016/j.mcna.2012.02.008. PMID 22793945.
- "Fluoroquinolone Antibacterial Drugs: Drug Safety Communication – FDA Advises Restricting Use for Certain Uncomplicated Infections". FDA. 12 May 2016. Archived from the original on 16 May 2016. Retrieved 16 May 2016.
- Gold Report 2021, pp. 104–107, Chapter 5: Management of exacerbations.
- Jolliffe DA, Greenberg L, Hooper RL, et al. (April 2019). "Vitamin D to prevent exacerbations of COPD: systematic review and meta-analysis of individual participant data from randomised controlled trials". Thorax. 74 (4): 337–345. doi:10.1136/thoraxjnl-2018-212092. PMID 30630893.
- Almadhoun, Khaled; Sharma, Sandeep (2021). "Bronchodilators". StatPearls. StatPearls Publishing. Retrieved 27 July 2021.
- Farne HA, Cates CJ (October 2015). "Long-acting beta2-agonist in addition to tiotropium versus either tiotropium or long-acting beta2-agonist alone for chronic obstructive pulmonary disease" (PDF). The Cochrane Database of Systematic Reviews (10): CD008989. doi:10.1002/14651858.CD008989.pub3. PMC 4164463. PMID 26490945.
- Oba Y, Keeney E, Ghatehorde N, Dias S, et al. (Cochrane Airways Group) (December 2018). "Dual combination therapy versus long-acting bronchodilators alone for chronic obstructive pulmonary disease (COPD): a systematic review and network meta-analysis". The Cochrane Database of Systematic Reviews. 12: CD012620. doi:10.1002/14651858.CD012620.pub2. PMC 6517098. PMID 30521694.
- Hopkinson NS, Molyneux A, Pink J, Harrisingh MC (July 2019). "Chronic obstructive pulmonary disease: diagnosis and management: summary of updated NICE guidance". BMJ. 366: l4486. doi:10.1136/bmj.l4486. hdl:10044/1/72505. PMID 31358491. S2CID 198984181.
- Cave AC, Hurst MM (May 2011). "The use of long acting β₂-agonists, alone or in combination with inhaled corticosteroids, in chronic obstructive pulmonary disease (COPD): a risk-benefit analysis". Pharmacology & Therapeutics. 130 (2): 114–43. doi:10.1016/j.pharmthera.2010.12.008. PMID 21276815.
- Spencer S, Karner C, Cates CJ, Evans DJ (December 2011). Spencer S (ed.). "Inhaled corticosteroids versus long-acting beta(2)-agonists for chronic obstructive pulmonary disease" (PDF). The Cochrane Database of Systematic Reviews (12): CD007033. doi:10.1002/14651858.CD007033.pub3. PMC 6494276. PMID 22161409.
- Wang J, Nie B, Xiong W, Xu Y (April 2012). "Effect of long-acting beta-agonists on the frequency of COPD exacerbations: a meta-analysis". Journal of Clinical Pharmacy and Therapeutics. 37 (2): 204–11. doi:10.1111/j.1365-2710.2011.01285.x. PMID 21740451. S2CID 45383688.
- Geake JB, Dabscheck EJ, Wood-Baker R, Cates CJ (January 2015). "Indacaterol, a once-daily beta2-agonist, versus twice-daily beta₂-agonists or placebo for chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews. 1: CD010139. doi:10.1002/14651858.CD010139.pub2. PMC 6464646. PMID 25575340.
- Decramer ML, Hanania NA, Lötvall JO, Yawn BP (2013). "The safety of long-acting β2-agonists in the treatment of stable chronic obstructive pulmonary disease". International Journal of Chronic Obstructive Pulmonary Disease. 8: 53–64. doi:10.2147/COPD.S39018. PMC 3558319. PMID 23378756.
- Nannini LJ, Lasserson TJ, Poole P (September 2012). Nannini LJ (ed.). "Combined corticosteroid and long-acting beta(2)-agonist in one inhaler versus long-acting beta(2)-agonists for chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews. 9 (9): CD006829. doi:10.1002/14651858.CD006829.pub2. PMC 4170910. PMID 22972099.
- Horita N, Goto A, Shibata Y, Ota E, Nakashima K, Nagai K, Kaneko T (February 2017). "Long-acting muscarinic antagonist (LAMA) plus long-acting beta-agonist (LABA) versus LABA plus inhaled corticosteroid (ICS) for stable chronic obstructive pulmonary disease (COPD)". The Cochrane Database of Systematic Reviews. 2: CD012066. doi:10.1002/14651858.CD012066.pub2. PMC 6464543. PMID 28185242.
- Zheng Y, Zhu J, Liu Y, et al. (November 2018). "Triple therapy in the management of chronic obstructive pulmonary disease: systematic review and meta-analysis". BMJ. 363: k4388. doi:10.1136/bmj.k4388. PMC 6218838. PMID 30401700.
- Karner C, Chong J, Poole P (July 2014). "Tiotropium versus placebo for chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews (7): CD009285. doi:10.1002/14651858.CD009285.pub3. PMID 25046211.
- Cheyne L, Irvin-Sellers MJ, White J (September 2015). "Tiotropium versus ipratropium bromide for chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews (9): CD009552. doi:10.1002/14651858.CD009552.pub3. PMID 26391969.
- Singh S, Loke YK, Furberg CD (September 2008). "Inhaled anticholinergics and risk of major adverse cardiovascular events in patients with chronic obstructive pulmonary disease: a systematic review and meta-analysis". JAMA. 300 (12): 1439–50. doi:10.1001/jama.300.12.1439. PMID 18812535. S2CID 205102861.
- Singh S, Loke YK, Enright P, Furberg CD (January 2013). "Pro-arrhythmic and pro-ischaemic effects of inhaled anticholinergic medications". Thorax. 68 (1): 114–6. doi:10.1136/thoraxjnl-2011-201275. PMID 22764216.
- Jones P (April 2013). "Aclidinium bromide twice daily for the treatment of chronic obstructive pulmonary disease: a review". Advances in Therapy. 30 (4): 354–68. doi:10.1007/s12325-013-0019-2. PMID 23553509. S2CID 3530290.
- Cazzola M, Page CP, Matera MG (June 2013). "Aclidinium bromide for the treatment of chronic obstructive pulmonary disease". Expert Opinion on Pharmacotherapy. 14 (9): 1205–14. doi:10.1517/14656566.2013.789021. PMID 23566013. S2CID 24973904.
- Ni H, Soe Z, Moe S (September 2014). "Aclidinium bromide for stable chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews. 9 (9): CD010509. doi:10.1002/14651858.CD010509.pub2. PMID 25234126.
- Ni H, Htet A, Moe S (June 2017). "Umeclidinium bromide versus placebo for people with chronic obstructive pulmonary disease (COPD)". The Cochrane Database of Systematic Reviews. 6: CD011897. doi:10.1002/14651858.CD011897.pub2. PMC 6481854. PMID 28631387.
- Ismaila AS, Huisman EL, Punekar YS, Karabis A (2015). "Comparative efficacy of long-acting muscarinic antagonist monotherapies in COPD: a systematic review and network meta-analysis". International Journal of Chronic Obstructive Pulmonary Disease. 10: 2495–517. doi:10.2147/COPD.S92412. PMC 4655912. PMID 26604738.
- Gartlehner G, Hansen RA, Carson SS, Lohr KN (2006). "Efficacy and safety of inhaled corticosteroids in patients with COPD: a systematic review and meta-analysis of health outcomes". Annals of Family Medicine. 4 (3): 253–62. doi:10.1370/afm.517. PMC 1479432. PMID 16735528.
- Drummond MB, Dasenbrook EC, Pitz MW, Murphy DJ, Fan E (November 2008). "Inhaled corticosteroids in patients with stable chronic obstructive pulmonary disease: a systematic review and meta-analysis". JAMA. 300 (20): 2407–16. doi:10.1001/jama.2008.717. PMC 4804462. PMID 19033591.
- Chinet T, Dumoulin J, Honore I, Braun JM, Couderc LJ, Febvre M, Mangiapan G, Maurer C, Serrier P, Soyez F, Terrioux P, Jebrak G (December 2016). "[The place of inhaled corticosteroids in COPD]". Revue des Maladies Respiratoires. 33 (10): 877–891. doi:10.1016/j.rmr.2015.11.009. PMID 26831345.
- Dong YH, Lin HH, Shau WY, Wu YC, Chang CH, Lai MS (January 2013). "Comparative safety of inhaled medications in patients with chronic obstructive pulmonary disease: systematic review and mixed treatment comparison meta-analysis of randomised controlled trials". Thorax. 68 (1): 48–56. doi:10.1136/thoraxjnl-2012-201926. PMID 23042705.
- Nannini LJ, Poole P, Milan SJ, Kesterton A (August 2013). "Combined corticosteroid and long-acting beta(2)-agonist in one inhaler versus inhaled corticosteroids alone for chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews. 8 (8): CD006826. doi:10.1002/14651858.CD006826.pub2. PMC 6486274. PMID 23990350.
- Kew KM, Seniukovich A (March 2014). "Inhaled steroids and risk of pneumonia for chronic obstructive pulmonary disease" (PDF). The Cochrane Database of Systematic Reviews. 3 (3): CD010115. doi:10.1002/14651858.CD010115.pub2. PMID 24615270.
- Higham A, Quinn AM, Cançado JE, Singh D (March 2019). "The pathology of small airways disease in COPD: historical aspects and future directions". Respir Res. 20 (1): 49. doi:10.1186/s12931-019-1017-y. PMC 6399904. PMID 30832670.
- "Recommendations | Chronic obstructive pulmonary disease in over 16s: diagnosis and management | Guidance | NICE". www.nice.org.uk. Retrieved 2019-10-30.
- Gold Report 2021, pp. 54–58, Chapter 3: Evidence supporting prevention and maintenance therapy.
- Mammen MJ, Sethi S (2012). "Macrolide therapy for the prevention of acute exacerbations in chronic obstructive pulmonary disease". Polskie Archiwum Medycyny Wewnetrznej. 122 (1–2): 54–9. doi:10.20452/pamw.1134. PMID 22353707. S2CID 35183033.
- Herath SC, Normansell R, Maisey S, Poole P (October 2018). "Prophylactic antibiotic therapy for chronic obstructive pulmonary disease (COPD)". The Cochrane Database of Systematic Reviews. 10: CD009764. doi:10.1002/14651858.CD009764.pub3. PMC 6517028. PMID 30376188.
- Simoens S, Laekeman G, Decramer M (May 2013). "Preventing COPD exacerbations with macrolides: a review and budget impact analysis". Respiratory Medicine. 107 (5): 637–48. doi:10.1016/j.rmed.2012.12.019. PMID 23352223.
- Kopsaftis Z, Wood-Baker R, Poole P (June 2018). "Influenza vaccine for chronic obstructive pulmonary disease (COPD)". The Cochrane Database of Systematic Reviews. 6: CD002733. doi:10.1002/14651858.CD002733.pub3. PMC 6513384. PMID 29943802.
- Teo E, Lockhart K, Purchuri SN, Pushparajah J, Cripps AW, van Driel ML (June 2017). "Haemophilus influenzae oral vaccination for preventing acute exacerbations of chronic bronchitis and chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews. 6: CD010010. doi:10.1002/14651858.CD010010.pub3. PMC 6481520. PMID 28626902.
- Poole P, Sathananthan K, Fortescue R (May 2019). "Mucolytic agents versus placebo for chronic bronchitis or chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews. 5: CD001287. doi:10.1002/14651858.CD001287.pub6. PMC 6527426. PMID 31107966.
- "Erdosteine". NICE. Retrieved 20 July 2021.
- Meldrum OW, Chotirmall SH (June 2021). "Mucus, Microbiomes and Pulmonary Disease". Biomedicines. 9 (6). doi:10.3390/biomedicines9060675. PMC 8232003. PMID 34199312.
- "Bronchitis". nhs.uk. 17 October 2017.
- Khor YH, Renzoni EA, Visca D, McDonald CF, Goh NS (July 2019). "Oxygen therapy in COPD and interstitial lung disease: navigating the knowns and unknowns". ERJ Open Res. 5 (3). doi:10.1183/23120541.00118-2019. PMC 6745413. PMID 31544111.
- Ekström M, Ahmadi Z, Bornefalk-Hermansson A, Abernethy A, Currow D (November 2016). "Oxygen for breathlessness in patients with chronic obstructive pulmonary disease who do not qualify for home oxygen therapy". The Cochrane Database of Systematic Reviews. 11: CD006429. doi:10.1002/14651858.CD006429.pub3. PMC 6464154. PMID 27886372.
- Jindal SK (2013). Chronic Obstructive Pulmonary Disease. Jaypee Brothers Medical. p. 139. ISBN 978-93-5090-353-7.
- O'Driscoll BR, Howard LS, Davison AG (October 2008). "BTS guideline for emergency oxygen use in adult patients". Thorax. 63 Suppl 6 (6): vi1-68. doi:10.1136/thx.2008.102947. PMID 18838559.
- "COPD – Treatment". U.S. National Heart Lung and Blood Institute. Archived from the original on 2012-04-27. Retrieved 2013-07-23.
- McNamara RJ, McKeough ZJ, McKenzie DK, Alison JA (December 2013). "Water-based exercise training for chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews (12): CD008290. doi:10.1002/14651858.CD008290.pub2. PMID 24353107.
- Menadue C, Piper AJ, van 't Hul AJ, Wong KK (May 2014). "Non-invasive ventilation during exercise training for people with chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews (5): CD007714. doi:10.1002/14651858.CD007714.pub2. PMID 24823712.
- McKeough ZJ, Velloso M, Lima VP, Alison JA (November 2016). "Upper limb exercise training for COPD". The Cochrane Database of Systematic Reviews. 11: CD011434. doi:10.1002/14651858.CD011434.pub2. PMC 6464968. PMID 27846347.
- Ngai SP, Jones AY, Tam WW (June 2016). "Tai Chi for chronic obstructive pulmonary disease (COPD)". The Cochrane Database of Systematic Reviews (6): CD009953. doi:10.1002/14651858.CD009953.pub2. PMID 27272131.
- Thomas MJ, Simpson J, Riley R, Grant E (June 2010). "The impact of home-based physiotherapy interventions on breathlessness during activities of daily living in severe COPD: a systematic review". Physiotherapy. 96 (2): 108–19. doi:10.1016/j.physio.2009.09.006. PMID 20420957.
- Wearing J, Beaumont S, Forbes D, Brown B, Engel R (February 2016). "The Use of Spinal Manipulative Therapy in the Management of Chronic Obstructive Pulmonary Disease: A Systematic Review". Journal of Alternative and Complementary Medicine. 22 (2): 108–14. doi:10.1089/acm.2015.0199. PMC 4761829. PMID 26700633.
- Osadnik CR, McDonald CF, Jones AP, Holland AE (March 2012). "Airway clearance techniques for chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews. 3 (3): CD008328. doi:10.1002/14651858.CD008328.pub2. PMID 22419331.
- Ferreira IM, Brooks D, White J, Goldstein R (December 2012). Ferreira IM (ed.). "Nutritional supplementation for stable chronic obstructive pulmonary disease". The Cochrane Database of Systematic Reviews. 12: CD000998. doi:10.1002/14651858.CD000998.pub3. PMID 23235577.
- Van Geffen WH, Douma WR, Slebos DJ, Kerstjens HA (29 August 2016). "Bronchodilators delivered by nebuliser versus inhalers for lung attacks of chronic obstructive pulmonary disease". Cochrane Database of Systematic Reviews. doi:10.1002/14651858.cd011826. hdl:11370/95fc3e6e-ebd0-440f-9721-489729f80add. Archived from the original on 13 September 2016.
- Wise R. "Chronic Obstructive Pulmonary Disease (COPD) – Pulmonary Disorders – Merck Manuals Professional Edition". Merck Manuals Professional Edition. Archived from the original on 28 December 2016. Retrieved 16 December 2016.
- Gold Report 2021, p. 96, Chapter 4: Managment of stable COPD.
- van Geffen, WH; Slebos, DJ; Herth, FJ; et al. (April 2019). "Surgical and endoscopic interventions that reduce lung volume for emphysema: a systemic review and meta-analysis". The Lancet. Respiratory medicine. 7 (4): 313–324. doi:10.1016/S2213-2600(18)30431-4. PMID 30744937.
- van Agteren JE, Carson KV, Tiong LU, Smith BJ (October 2016). "Lung volume reduction surgery for diffuse emphysema". The Cochrane Database of Systematic Reviews. 10: CD001001. doi:10.1002/14651858.CD001001.pub3. PMC 6461146. PMID 27739074.
- "Lung Scintigraphy in COPD". Seminars in Nuclear Medicine. 1 January 2019. pp. 16–21. doi:10.1053/j.semnuclmed.2018.10.010. Retrieved 4 July 2021.
- "1 Recommendations | Endobronchial valve insertion to reduce lung volume in emphysema | Guidance | NICE". www.nice.org.uk. Retrieved 7 July 2021.
- Klooster K, Slebos DJ (May 2021). "Endobronchial Valves for the Treatment of Advanced Emphysema". Chest. 159 (5): 1833–1842. doi:10.1016/j.chest.2020.12.007. PMC 8129734. PMID 33345947.
- Welling JB, Slebos DJ (August 2018). "Lung volume reduction with endobronchial coils for patients with emphysema". J Thorac Dis. 10 (Suppl 23): S2797–S2805. doi:10.21037/jtd.2017.12.95. PMC 6129816. PMID 30210833.
- Valipour, Arschang (1 January 2017). "Bronchoscopic Thermal Vapour Ablation: Hot Stuff to Treat Emphysema Patients!". Archivos de Bronconeumología (English Edition). pp. 1–2. doi:10.1016/j.arbr.2016.11.009. Retrieved 3 July 2021.
- "WHO Disease and injury country estimates". World Health Organization. 2009. Archived from the original on 2009-11-11. Retrieved Nov 11, 2009.
- Murray CJ, Vos T, Lozano R, et al. (December 2012). "Disability-adjusted life years (DALYs) for 291 diseases and injuries in 21 regions, 1990-2010: a systematic analysis for the Global Burden of Disease Study 2010". Lancet. 380 (9859): 2197–223. doi:10.1016/S0140-6736(12)61689-4. PMID 23245608.
- Vos T, Flaxman AD, Naghavi M, et al. (December 2012). "Years lived with disability (YLDs) for 1160 sequelae of 289 diseases and injuries 1990–2010: a systematic analysis for the Global Burden of Disease Study 2010". Lancet. 380 (9859): 2163–96. doi:10.1016/S0140-6736(12)61729-2. PMC 6350784. PMID 23245607.
- Gold Report 2021, pp. 26–33, Chapter 2:Diagnosis and assessment.
- "COPD prevalence". NICE. Retrieved 18 July 2021.
- "Chronic obstructive pulmonary disease (COPD) Fact sheet N°315". WHO. January 2015. Archived from the original on 2016-03-04.
- Rycroft CE, Heyes A, Lanza L, Becker K (2012). "Epidemiology of chronic obstructive pulmonary disease: a literature review". International Journal of Chronic Obstructive Pulmonary Disease. 7: 457–94. doi:10.2147/COPD.S32330. PMC 3422122. PMID 22927753.
- "CDC - Basics About COPD - Chronic Obstructive Pulmonary Disease (COPD)". www.cdc.gov. 9 June 2021. Retrieved 18 July 2021.
- Torio CM, Andrews RM (2006). "National Inpatient Hospital Costs: The Most Expensive Conditions by Payer, 2011: Statistical Brief #160". Healthcare Cost and Utilization Project (HCUP) Statistical Briefs. PMID 24199255. Archived from the original on 2017-03-14.
- "The top 10 causes of death". www.who.int.
- Petty TL (2006). "The history of COPD". International Journal of Chronic Obstructive Pulmonary Disease. 1 (1): 3–14. doi:10.2147/copd.2006.1.1.3. PMC 2706597. PMID 18046898.
- Lavelle P (12 August 2008). "Fact File: COPD". ABC Health & Wellbeing. Australian Broadcasting Corporation. Retrieved 11 May 2021.
- "Emphysema". Dictionary.com. Archived from the original on 24 November 2013. Retrieved 21 November 2013.
- Ziment I (1991). "History of the treatment of chronic bronchitis". Respiration; International Review of Thoracic Diseases. 58 (Suppl 1): 37–42. doi:10.1159/000195969. PMID 1925077.
- Wright JL, Churg A (2008). "Pathologic Features of Chronic Obstructive Pulmonary Disease: Diagnostic Criteria and Differential Diagnosis" (PDF). In Fishman A, Elias J, Fishman J, Grippi M, Senior R, Pack A (eds.). Fishman's Pulmonary Diseases and Disorders (4th ed.). McGraw-Hill. pp. 693–705. ISBN 978-0-07-164109-8.
- Woolcock A (1984). "The Search for Words to Describe the Bad Blowers". Chest. 85 (6): 73S–74S. doi:10.1378/chest.85.6_Supplement.73S.
- Waldbott GL (1965). A struggle with Titans. Carlton Press. p. 6.
- Fishman AP (May 2005). "One hundred years of chronic obstructive pulmonary disease". American Journal of Respiratory and Critical Care Medicine. 171 (9): 941–8. doi:10.1164/rccm.200412-1685OE. PMID 15849329.
- Yuh-Chin TH (2012). A clinical guide to occupational and environmental lung diseases. Humana Press. p. 266. ISBN 978-1-62703-149-3.
- Des Jardins T (2013). Clinical Manifestations & Assessment of Respiratory Disease (6th ed.). Elsevier Health Sciences. p. 176. ISBN 978-0-323-27749-5.
- "November is National COPD Awareness Month | NHLBI, NIH". www.nhlbi.nih.gov. Retrieved 21 July 2021.
- Lomborg B (2013). Global problems, local solutions : costs and benefits. Cambridge University Press. p. 143. ISBN 978-1-107-03959-9.
- Bloom D (2011). The Global Economic Burden of Noncommunicable Diseases (PDF). World Economic Forum. p. 24. Archived (PDF) from the original on 2015-02-04.
- Nambiar S, Bong How S, Gummer J, Trengove R, Moodley Y (February 2020). "Metabolomics in chronic lung diseases". Respirology. 25 (2): 139–148. doi:10.1111/resp.13530. PMID 30907495.
- Inamdar AC, Inamdar AA (October 2013). "Mesenchymal stem cell therapy in lung disorders: pathogenesis of lung diseases and mechanism of action of mesenchymal stem cell". Experimental Lung Research. 39 (8): 315–27. doi:10.3109/01902148.2013.816803. PMID 23992090. S2CID 46052894.
- Oh DK, Kim YS, Oh YM (January 2017). "Lung Regeneration Therapy for Chronic Obstructive Pulmonary Disease". Tuberculosis and Respiratory Diseases. 80 (1): 1–10. doi:10.4046/trd.2017.80.1.1. PMC 5256352. PMID 28119741.
- Conese M, Piro D, Carbone A, Castellani S, Di Gioia S (2014). "Hematopoietic and mesenchymal stem cells for the treatment of chronic respiratory diseases: role of plasticity and heterogeneity". TheScientificWorldJournal. 2014: 859817. doi:10.1155/2014/859817. PMC 3916026. PMID 24563632.
- McQualter JL, Anthony D, Bozinovski S, Prêle CM, Laurent GJ (November 2014). "Harnessing the potential of lung stem cells for regenerative medicine". The International Journal of Biochemistry & Cell Biology. 56: 82–91. doi:10.1016/j.biocel.2014.10.012. PMID 25450456.
- Tzouvelekis A, Ntolios P, Bouros D (2013). "Stem cell treatment for chronic lung diseases". Respiration; International Review of Thoracic Diseases. 85 (3): 179–92. doi:10.1159/000346525. PMID 23364286.
- Tzouvelekis A, Laurent G, Bouros D (February 2013). "Stem cell therapy in chronic obstructive pulmonary disease. Seeking the Prometheus effect". Current Drug Targets. 14 (2): 246–52. doi:10.2174/1389450111314020009. PMID 23256721.
- Gompelmann D, Eberhardt R, Herth FJ (August 2015). "Novel Endoscopic Approaches to Treating Chronic Obstructive Pulmonary Disease and Emphysema". Seminars in Respiratory and Critical Care Medicine. 36 (4): 609–15. doi:10.1055/s-0035-1555614. PMID 26238645.
- Gøtzsche PC, Johansen HK (September 2016). "Intravenous alpha-1 antitrypsin augmentation therapy for treating patients with alpha-1 antitrypsin deficiency and lung disease". The Cochrane Database of Systematic Reviews. 9: CD007851. doi:10.1002/14651858.CD007851.pub3. PMC 6457738. PMID 27644166.
- McLean S, Nurmatov U, Liu JL, Pagliari C, Car J, Sheikh A (July 2011). "Telehealthcare for chronic obstructive pulmonary disease" (PDF). The Cochrane Database of Systematic Reviews (7): CD007718. doi:10.1002/14651858.CD007718.pub2. PMID 21735417.
- Cheng J, Eroglu A (June 2021). "The Promising Effects of Astaxanthin on Lung Diseases". Adv Nutr. 12 (3): 850–864. doi:10.1093/advances/nmaa143. PMID 33179051.
- Akers RM, Denbow DM (2008). Anatomy and Physiology of Domestic Animals. Wiley. p. 852. ISBN 978-1-118-70115-7.
- Wright JL, Churg A (December 2002). "Animal models of cigarette smoke-induced COPD". Chest. 122 (6 Suppl): 301S–306S. doi:10.1378/chest.122.6_suppl.301S. PMID 12475805. S2CID 30461445.
- Churg A, Wright JL (2007). "Animal models of cigarette smoke-induced chronic obstructive lung disease". Models of Exacerbations in Asthma and COPD. Contributions to Microbiology. 14. pp. 113–25. doi:10.1159/000107058. ISBN 978-3-8055-8332-9. PMID 17684336.
- "Recurrent Airway Obstruction in Horses - Respiratory System". Veterinary Manual. Retrieved 7 July 2021.
- Miller MS, Tilley LP, Smith FW (January 1989). "Cardiopulmonary disease in the geriatric dog and cat". The Veterinary Clinics of North America. Small Animal Practice. 19 (1): 87–102. doi:10.1016/S0195-5616(89)50007-X. PMID 2646821.
- Global Strategy for Prevention, Diagnosis and Management of COPD: 2021 Report (PDF). Global Initiative for Chronic Obstructive Lung Disease. 25 November 2020. Retrieved 28 June 2021.
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