三角肌與大臀肌纖維化拘縮症之肌電圖變化

Electromyography in Deltoid and Gluteal Contracture

劉景寬(Ching-Kuan Liu) ； 陳明招(Ming-Chao Chen)

《The Kaohsiung Journal of Medical Sciences》 2卷3期 (1986/03) Pp. 184-188

https://doi.org/10.6452/KJMS.198603.0184

摘要

40位三角肌或大臀肌纖維化拘縮症的病人共有50個肌肉檢體的病例接受肌電圖檢查，使用Medelec MS7肌電器配備平均值儀，並採用針管徑0.305 mm的同心圓針。最初38個病例只接受常規肌電圖檢查，另外12個病例又計算三角肌的運動神經元電位持續時間的平均值。病患的肌電圖不正常檢出率為96%，包括出現自發性正相波有16例 (佔32%)；出現多相波有44例 (佔88%)；不完全干擾有32例 (佔64%)。正常控制組中的三頭肌運動元電位持續時間的平均值為6.7±1.5 msec，而病患組為4.5±1.4 msec，顯示為有意義的減小 (p＜0.001)。35位接受肌肉切片檢查，具同型肌纖維聚集組與不具同型肌纖維聚集組，兩組的肌電圖並無有意義的差別 (p＞0.05)。從病患組中任選21個病例，作肱二頭肌電圖常規檢查與控制組作比較，結果顯示病患組的不正常率 (42.9%)比控制組 (9.5%)為有意義的增加。再任選21例，比較纖維化中心帶與距中心帶5 cm處的肌電圖不正常出現率，結果不具有意義的差別 (p＞0.05)。

並列摘要

Electromyographic studies were carried out to investigate 50 muscles in 40 patients with deltoid or gluteal fibrosis. Using a Medelec MS7 machine with concentric needle electrodes, routine electromyography was carried out in 38 cases. The mean duration of motor unit potential (MUP) was calculated in another 12 cases. 12 controls, randomly selected and matched for age, were similarly examined to obtain control quantitative data. The frequency of electromyographic abnormalities was 96.0%. The abnormalities included spontaneous positive waves in 16 studies (32.0%), polyphasic potential in 44 studies (88.0%), and incomplete interference during max. effort in 32 studies (64.0%). In the controls, the mean duration of MUP in the deltoid was 6.7±1.5 msec., while the patients showed a significant reduction, with a mean duration of 4.5±1.4 msec. (p＜0.001).
In 21 cases randomly selected, there was no significant difference in the incidence of abnormal electromyographic findings between the center of the fibrotic area and 5 cm away from the center of the fibrotic area. (p＞0.05).
Fifteen of the 35 histopathological studies (42.9%) showed fibre type grouping in addition to the evidence of myopathic changes. However, there was no significant difference in the incidence of abnormal electromyographic findings between this and the group without fiber type grouping. (p＞0.05).
Biceps brachii were simultaneously examined with EMG in 21 cases. The incidence of abnormalities was 42.9%, which was significantly higher than that of the controls (9.5%).

並列關鍵字

gluteal contracture ； deltoid contracture ； electromyography