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Journal of the Korean Academy of Rehabilitation Medicine 2009;33(6):687-692.
The Value of Electrodiagnostic Studies Performed before and after Microvascular Decompression.
Kim, Myeong Ok , Jung, Han Young , Kim, Chang Hwan , Kim, Eun Young , Lee, Hye Jin , Yeo, Sang Won
1Department of Physical and Rehabilitation Medicine, Inha University College of Medicine, Korea. 11984462@naver.com
2Department of Neurosurgery, Inha University College of Medicine, Korea.
편측 안면경련의 수술 전후 시행한 전기진단학적 검사들의 유용성
김명옥, 정한영, 김창환, 김은영1, 이혜진, 여상원
인하대학교 의과대학 재활의학교실, 1신경외과학교실
To evaluate the usefulness of electrodiagnostic studies in hemifacial spasm patients by comparing abnormal muscle response (AMR) and irregular bursting discharge (IBD) before and after the surgery of hemifacial spasm.
Fifty nine patients who had been diagnosed with hemifacial spasm and underwent microvascular decompression (MVD) were chosen. The AMR was carried out in three different ways; 1) abnormal response of orbicularis oris when stimulating the supraorbital branch of trigeminal nerve (AMR1), 2) abnormal response of mentalis when stimulating the zygomatic branch of facial nerve (AMR2) and 3) abnormal response of orbicularis oculi when stimulating the marginal mandibular branch of facial nerve (AMR3). We identified the correlation between the loss of IBD and the AMR results per each method, the results of the electrodiagnostic studies according to the onset duration, and the point of follow up time.
The AMR and IBD decreased or disappeared after the surgery. AMR which had a significant statistical correlation with the changes of IBD, were AMR2 and AMR3. No definite changes were seen regarding the onset duration. According to the studies done during the follow up period, there was a significant reduction in lateral spread and IBD as the length of the follow up period lengthened.
Investigation of pre- and postoperative electrodiagnostic study, especially abnormal muscle response (facio- facial reflex) is very helpful in predicting the outcome of operation and the overall prognosis. (J Korean Acad Rehab Med 2009; 33: 687-692)
Key Words: Hemifacial spasm, Electrodiagnostic study, Abnormal muscle response, Postoperative change


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