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 neurochirurgicaauthors
Zheng X,Hong W,Tang Y,Ying T,Wu Z,Shang M,Feng B,Zhang W,Hua X,Zhong J,Li Sdoi
10.1007/s00701-012-1304-6subject
Has Abstractpub_date
2012-05-01 00:00:00pages
799-805issue
5eissn
0001-6268issn
0942-0940journal_volume
154pub_type
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journal_title:Acta neurochirurgica
pub_type: 临床试验,杂志文章,随机对照试验
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