Preservation of facial function during removal of acoustic neuromas

Use of monopolar constant-voltage stimulation and EMG

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✓ The authors describe a modification in the way the facial nerve is stimulated electrically during operations to remove medium and large-sized (> 2 cm) acoustic tumors. This consists of monopolar stimulation with low internal impedance. Proper use of this modified stimulation technique together with acoustic monitoring of the electromyographic responses of facial muscles helps to preserve facial nerve function in patients undergoing these operations, and also decreases the duration of the operation.

Article Information

Address reprint requests to: Aage R. Møller, Ph.D., Department of Neurological Surgery, Room 9402, Presbyterian-University Hospital, University of Pittsburgh School of Medicine, 230 Lothrop Street, Pittsburgh, Pennsylvania 15213.

© AANS, except where prohibited by US copyright law.

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    The hand-held electrode.

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    Block diagram of the recording and stimulation set-up. EXT.SYNC. = external synchronization; CRO = cathode ray oscilloscope; FET = field effect transistor.

References

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