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The spectrum of electrophysiological abnormalities in Bell's palsy
HILL MD; MIDRONI G; GOLDSTEIN WC
CAN J NEUROL SCI , 2001, vol. 28, n° 2, p. 130-133 Doc n°: 101205 Localisation : Documentation IRR Descripteurs : AC232 - ATTEINTES DES NERFS RACHIDIENS As part of an investigation of a suspected "outbreak" of Bell's palsy in the Greater Toronto Area, a population-based sample of patients with Bell's palsy was investigated electrophysiologically to help understand the spectrum of abnormalities that can be seen in this setting. METHODS: Two hundred and twenty-four patients were surveyed, of whom 91 underwent formal neurological assessment. Of the latter, 44 were studied electrophysiologically using standard techniques. Thirty-two of the 44 patients fulfilled clinical criteria for Bell's palsy. RESULTS: A wide range of electrophysiological changes was observed. Blink responses were the most useful test showing diagnostic sensitivity of 81% and specificity of 94% compared to the contralateral control side. Needle electromyography was additionally helpful in only one patient of six with normal conduction studies. CONCLUSIONS: There is a wide spectrum of electrophysiological abnormalities in Bell's palsy. Blink reflex latencies may be under-utilized in the assessment of the facial nerve in Bell's palsy. Facial EMG is not generally useful in routine assessment. Langue : ANGLAIS Tiré à part : OUI Identifiant basis : 2001217153 |
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