Clinical and experimental studies of large amplitude action potential of the suffered facial muscles in intratemporal XXXX .

@entity1 @entity17 @entity2123 @entity840 @entity2850 @entity3541
OBJECTIVE: To testify the phenomenon that large amplitude action potential appears at the early stage of @entity3541 , and to search for the mechanism through clinical and experimental studies. @entity1 (ANIMALS) AND METHODS: The action potentials of the orbicular ocular and oral muscles were recorded in 34 normal @entity1 by electromyogram instruments. The normal range of amplitude percentage was found out according to the normal distribution. One hundred @entity1 with @entity3541 were also studied. The action potentials of facial muscles were recorded in 17 @entity840 before and after the facial nerve was compressed and the facial nerve was examined under electromicroscope before and after the compression. RESULTS: The amplitude percentage of the suffered side to the healthy side was more than 153 percent in 6 of the 100 @entity1 . Large amplitude action potential occured in 35 per cent @entity840 which were performed the experiment of @entity2850 . Electromicroscopic examination revealed separation of the lammae of the @entity17 in the @entity840 which exhibited large amplitude action potential. CONCLUSION: The facial nerve exhibited a temporary over-excitability at the early stage of @entity2123 in some @entity1 and @entity840 . If the injury was limited in the myelin sheath, the prognosis was relatively good.
