Ramsay Hunt syndrome type 2
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|Ramsay Hunt syndrome type 2|
|Other names||Herpes zoster oticus|
Ramsay Hunt syndrome type 2, also known as herpes zoster oticus, is a disorder that is caused by the reactivation of varicella zoster virus in the geniculate ganglion, a nerve cell bundle of the facial nerve.
Ramsay Hunt syndrome type 2 typically presents with inability to move many facial muscles, pain in the ear, taste loss on the front of the tongue, dry eyes and mouth, and a vesicular rash.
Signs and symptoms
Symptoms include acute facial nerve paralysis, pain in the ear, taste loss in the front two-thirds of the tongue, dry mouth and eyes, and an erythematous vesicular rash in the ear canal, the tongue, and/or hard palate.
Since the vestibulocochlear nerve is in proximity to the geniculate ganglion, it may also be affected, and patients may also suffer from tinnitus, hearing loss, and vertigo. Involvement of the trigeminal nerve can cause numbness of the face.
Ramsay Hunt syndrome type 2 refers to shingles of the geniculate ganglion. After initial infection, varicella zoster virus lies dormant in nerve cells in the body, where it is kept in check by the immune system. Given the opportunity, for example during an illness that suppresses the immune system, the virus travels to the end of the nerve cell, where it causes the symptoms described above.
The affected ganglion is responsible for the movements of facial muscles, the touch sensation of a part of ear and ear canal, the taste function of the frontal two-thirds of the tongue, and the moisturization of the eyes and the mouth. The syndrome specifically refers to the combination of this entity with weakness of the muscles activated by the facial nerve. In isolation, the latter is called Bell's palsy.
However, as with shingles, the lack of lesions does not definitely exclude the existence of a herpes infection. Even before the eruption of vesicles, varicella zoster virus can be detected from the skin of the ear.
Ramsay Hunt syndrome type 2 can be diagnosed based on clinical features, however, in ambiguous cases PCR or direct immunofluorescent assay of vesicular fluid can help with the diagnosis. Laboratory studies such as WBC count, ESR and electrolytes should be obtained to distinguish infectious versus inflammatory etiologies.
On physical exam look for vesicular exanthema on the external auditory canal, concha and or pinna. Dry eyes with possible lower cornea epithelium damage due to incomplete closure of eyelids.
Ramsay Hunt syndrome type 2 can usually be diagnosed based on clinical features. However, for suspected cases with unclear presentation, varicella zoster virus can be isolated from vesicle fluid. Tear culture PCR can have positive varicella zoster virus. However 25-35% of patients with Bell's palsy can have false positive varicellar zoster virus detected in tears. If central nervous system complications such as meningitis, ventriculitis or meningoencephalitis are suspected, prompt lumbar puncture with spinal fluid analysis and imaging (CT head) are recommended.
Treatment with prednisone and the antiviral drug acyclovir 800 mg 5 times a day is controversial, with some studies showing complete recovery in patients if started within the first three days of facial paralysis. Chances of recovery appear to decrease when treatment is delayed. Delay of treatment may result in permanent facial nerve paralysis. However, some studies demonstrate that even when steroids are started promptly, only 22% of all patient achieve full recovery of facial paralysis.
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