Discovery of a new waveform for intraoperative monitoring of hemifacial spasms.

Abstract:

BACKGROUND:Surgeons often rely on intraoperative electrophysiological monitoring to determine whether decompression is sufficient during microvascular decompression surgery for hemifacial spasms. A new monitoring method is needed when an abnormal muscle response is occasionally not available or is unreliable. This study was an observational clinical trial exploring a new waveform recorded from the facial muscles while the offending artery wall was electrically stimulated. METHODS:Thirty-two patients with typical hemifacial spasm and 12 with trigeminal neuralgia as a control were included. The facial muscle response was recorded during microvascular decompression surgery while the offending artery wall was stimulated (2 mA × 0.2 ms). The latency, amplitude, and effective refractory period were analyzed. RESULTS:A waveform was recorded from the facial muscles of patients with hemifacial spasm when the offending artery wall was stimulated and was named the "Z-L response." The latency was 7.3 ± 0.8 ms, the amplitude was 0.08 ± 0.02 mV, and the effective refractory period was 3.5-4 ms. The Z-L response disappeared immediately after microvascular decompression. No waveform was recorded from the facial muscles of patients with trigeminal neuralgia while the anterior inferior cerebellar artery, which adheres to the facial nerve, was stimulated (2 mA × 0.2 ms). CONCLUSION:We found a new waveform for intraoperative monitoring of hemifacial spasm. The Z-L response was useful when the abnormal muscle response was absent before decompression or persisted after all vascular compressions were properly treated. Particularly, the Z-L response may help neurosurgeons determine the real culprit when multiple offending vessels exist.

journal_name

Acta Neurochir (Wien)

journal_title

Acta neurochirurgica

authors

Zheng X,Hong W,Tang Y,Ying T,Wu Z,Shang M,Feng B,Zhang W,Hua X,Zhong J,Li S

doi

10.1007/s00701-012-1304-6

subject

Has Abstract

pub_date

2012-05-01 00:00:00

pages

799-805

issue

5

eissn

0001-6268

issn

0942-0940

journal_volume

154

pub_type

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