Myokymia in the course of Bell's palsy. An electromyographic study.

Facial myokymia has been described in association with many morbid conditions, most frequently multiple sclerosis (MS) and brainstem tumors (BST). Very few reports deal with myokymia in the course of Bell's palsy, despite high frequency of the disease. A series of 88 consecutive patients with Bell's palsy is presented, in which serial EMG controls were performed in the initial phases of facial palsy. Twenty three showed myokymic activity detected by EMG, while clinically evident myokymia could be observed only in 8. EMG features did not reveal any peculiarity as compared with myokymic discharges reported in other pathological situations. Considering the high incidence of myokymic activity reported in the course of Bell's palsy, it is the authors' opinion that an occasional finding of myokymia, both clinically evident or detected by EMG, should not necessarily lead one to suspect serious aetiologies.