Abstract

Facial paralysis of abrupt onset is common. Few cases are associated with otic infection, and there is debate about possibly causal relations with diabetes, hypertension and pregnancy. Almost all cases are idiopathic (Bell's palsy).One theory ascribes the initial insult to unstable blood vessels, susceptible to excessive vasoconstriction on exposure to cold or other stimuli. Ischemia leads to swelling and compression of the nerve within its bony canal, thus aggravating the ischemia. But the relation to cold is uncertain; there is doubt about liability to compression since the nerve occupies less than 50 per cent of the canal; the postulated . . .

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