Hemifacial Spasm; EMG-Histogram Evaluation
1993 Volume 1993 Issue Supplement66 Pages 43-55
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1993 Volume 1993 Issue Supplement66 Pages 43-55
This study investigated a new method of evaluating the severity of hemifacial spasm (HFS) with an aid of an EMG-Histogram. A point at issue in HFS is the irregularity of attacks. To determine the most effective and appropriate time to test, EMG-telemetries were performed on 5 patients whose HFS were severe enough to involve the platysma. This examination revealed that 97% of the spastic attack information could be documented in a 20 min recording.
Based on these findings, EMG-Histograms were made with an EMG-recording system (Medelec ATA6) and a X-Y plotter (YHP 3000/33). The Medelec is equipped to calculate across a set of EMG voltage changes. This paper showed the followings: 1. Participation of the trigeminal nerve to proprioceptor of the facial muscles.2. Exaggeration (positive-feedback) of the HFS by tonal perception of the spasm, and light stimulation.3. Diagnosis of functional spasm by reduction of the EMG-Histogram.4. Evaluation of medical and surgical treatment.
EMG-Histogram is a useful method of evaluating the severity of HFS and the efficacy of therapy.
