Bell Palsy

Published on 25/03/2015 by admin

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Last modified 25/03/2015

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Chapter 609 Bell Palsy

Bell palsy is an acute unilateral facial nerve palsy that is not associated with other cranial neuropathies or brainstem dysfunction. It is a common disorder at all ages from infancy through adolescence and usually develops abruptly about 2 wk after a systemic viral infection. The preceding infection is caused by the herpes simplex virus, varicella-zoster virus, Epstein-Barr virus, Lyme disease, mumps virus, or Mycoplasma (Table 609-1). Active or reactivation of herpes simplex or varicella-zoster virus may be the most common cause of Bell palsy (Fig. 609-1). The disease is occasionally a postinfectious allergic or immune demyelinating facial neuritis. It also may be a focal toxic or inflammatory neuropathy and has been associated with ribavirin and interferon-α therapy for hepatitis C.

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