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Facial paralysis of lower-motor-neurone origin may be due either to physiological (reversible) block or to degeneration of the facial nerve. The prognosis depends on which has occurred, the chances of full recovery being good in physiological block but poor in degenera, tion. The present study demonstrates how accurately this knowledge may be acquired early in the course of the paralysis by a simple electrodiagnostic test.
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Campbell et al. (1962) studied this question.
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