A New Method for Monitoring Abnormal Muscle Response in Hemifacial Spasm: A Prospective Study

Hemifacial spasm (HFS) is a neurovascular compression syndrome and microvascular decompression (MVD) is the only curative treatment. An intraoperative abnormal muscle response (AMR) has been a reliable diagnostic tool and indicator of complete facial nerve decompression. An AMR is elicited by stimulation of a facial nerve branch and is recorded from facial muscles innervated by other nerve branches. Typically, it is instantly eliminated on intraoperative facial nerve electromyography (EMG) when the facial nerve is decompressed.

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