末梢顔面神経麻痺と積分筋電図

概要

論文の詳細を見る
Conventional electromyograms on voluntary movements can be converted into square waves with the aid of an AC-DC converter. The height of these waves contains components of the amplitude and firing frequency of original muscle discharges. Consequently, this means that the wave height indicates the degree of muscle paralysis.Following this conversion method, EMGs of the frontal muscle, orbicularis oculi muscle, and orbicularis oris muscle were recorded in 10 normal subjects and 11 facial paralysis patients. In the normal, the ratios of the one to the other side were 86.4±5.9% in the frontal muscle, 88.5±9.5% in the orbicularis oculi muscle and 96.1±3.4% in the orbicularis oris. In facial paralysis, paralysis scores of rating scale proposed by Yanagihara (1977) were served as a degree of facial paralysis, and EMG measurements above mentioned were undertaken at several points during the recovery process.Each EMG ratio of the affected side to the normal side was calculated. EMG ratios showed increase acompanied by recovery of paralysis score value.The ratios for all patients had good correlation with paralysis scores in rating scales showing the correlation factor, 0.86 in the orbicularis oculi muscle and 0.74 in the oris muscle.This means that integration of conventional EMGs is a good parameter of facial paralysis.