Electrodiagnostic study in delayed facial palsy after closed head injury.

Abstract
The time course of electrical reactions in this condition varied much from that after section of the facial nerve or after Bell''s palsy. It was at least 1 wk before denervation could be suspected in the latter conditions by electrodiagnostic methods. In post-traumatic delayed facial palsy electrical reactions were demonstrated showing denervation at the time of palsy or even a few days before; this was probably related to its pathogenesis. Denervation occurred in 82% of cases, which is about double the incidence in Bell''s palsy.

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