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- Title
Brain stem auditory evoked potentials in patients with hemifacial spasm.
- Authors
Møsller, Margarbta B.; Møsller, Aage R.; Jannetta, Peter J.
- Abstract
Brain stem auditory evoked potentials (BSEP) were elicited and recorded from the spasm side and from the non-spasm side of 39 patients operated upon to relieve hemifacial spasm. Thirty-seven patients were studied before the microvascular decompression surgery at the root entry zone of the facial nerve was performed. Thirty-one patients were studied 4 to 10 days postoperatively, and 7 were evaluated a second time, 6 weeks to 6 months after surgery. The latencies of peaks III and V of the ipsilaterally recorded BSEP were statistically significantly (p<0.05) larger on the spasm side than were those recorded on the non-spasm side. The I to III interwove latencies did not show any statistically significant difference. This implies that the effects of hemifacial spasm are not limited to the facial nerve but extend to other cranial nerves and other parts of the brain stem than those involved in facial motor function. The pure tone thresholds recorded before and after the operations were essentially the same in the majority of the patients, were 10 to 15 dB lower in 13% of the patients postoperatively, and were 10 to 15 dB higher in 13% of the patients postoperatively. One patient suffered a moderate sensorineural low-frequency hearing loss postoperatively.
- Publication
Laryngoscope, 1982, Vol 92, Issue 8, p848
- ISSN
0023-852X
- Publication type
Article
- DOI
10.1288/00005537-198208000-00003