For evaluating the significance of intraoperative electrophysiologic monitoring and observing the change of clinical and electrophysiologic results after Microvascular Decompression(MVD), we did follow-up 227 cases with hemifacial spasm, who had
been
operated at Bong Seng Memorial Hospital and Dong Rae Bong Seng Hospital, for more than 2 months. For comparing, we divided patients into Monitoring group(n=134) and Non-monitoring group(n=93). The success rate of MVD was 89.5% at POD 7 and 92.3%
at
follow-up, respectvely, and there was no statistical difference between Monitoring and Non-monitoring group. But the distribution of offenders was only statistically different from each other. During follow-up, the clinical results changed at 59
cases
of 142(41.5%), and hemifacial spasm in 32 cases gradually disappeared. In the 57 cases, which were able to test follow-up electrophysiologic study, 73.7% electrophysiologically changed, and the ratio of completely disappeared Abnormal Muscle
Response
was statistically increased from 35.1% at POD 7 to 70.2% at follow-up study. In the 85 cases, which were able to follow-up at Monitoring group. the results of electrophysiologic study at POD 7 were statistically correlated with clinical results
at
follow-up.
According to the above results, electrophysiologic study is helpful for identifying the offenders and determining the adequacy of vascular decompression, clinical and electrophysiologic status of hemifacial spasm after MVD has continuously
changed,
and
the results of electrophysiologic study at POD 7 are useful for predicting the clinical results at follow-up.
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