The risk factors thought to be associated with a poor outcome in patients with Bell palsy include (1) age greater than 60 years, (2) complete paralysis, and (3) decreased taste or salivary flow on the side of paralysis (usually 10%-25% compared with the patient's normal side). Other factors thought to be associated with poor outcome include pain in the posterior auricular area and decreased lacrimation.
For more on the prognosis in patients with Bell palsy, read here.
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Cite this: Selim Benbadis. Fast Five Quiz: How Much Do You Know About Bell Palsy? - Medscape - Sep 29, 2015.