Publication: Hemifacial spasm: an electrophysiological evidence of facial motorneurons hyperexcitability.
Issued Date
1994-12-01
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ISSN
01252208
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2-s2.0-0028694454
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of the Medical Association of Thailand. Vol.77, No.12 (1994), 627-632
Suggested Citation
S. Eksantivongs, N. Poungvarin, A. Viriyavejakul, J. Punyamee Hemifacial spasm: an electrophysiological evidence of facial motorneurons hyperexcitability.. Journal of the Medical Association of Thailand. Vol.77, No.12 (1994), 627-632. Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/9626
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Title
Hemifacial spasm: an electrophysiological evidence of facial motorneurons hyperexcitability.
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Abstract
Twenty patients with primary hemifacial spasm and ten patients with Parkinson's disease were studied by means of paired stimuli blink reflex. The second stimuli were delivered at a varying time interval between 50-900 ms. The R2 response's absolute refractory periods were compared between patients and twenty one age-matched normal controls as well as between hemifacial spasm and Parkinson's disease. In normal subjects, the mean absolute refractory period was found to be 271.42 +/- 64.36 ms, in hemifacial spasm 160.00 +/- 50.62 ms and in Parkinson's disease 157.14 +/- 53.45 ms. The absolute refractory periods obtained from patients were significantly shorter than in normal controls (p < 0.05). However the values between patients with hemifacial spasm and Parkinson's disease were not (p > 0.05). This result strongly supports bilateral facial motoneurons hyperexcitability as the underlying mechanism of hemifacial spasm.