Aminoff M J, Olney R K, Parry G J, Raskin N H
Department of Neurology, School of Medicine, University of California, San Francisco 94143.
Neurology. 1988 Apr;38(4):546-50. doi: 10.1212/wnl.38.4.546.
We report the results of detailed electrophysiologic studies in 23 patients with suspected brachial plexopathies. In five with neurogenic thoracic outlet syndrome, needle EMG and determination of size of ulnar sensory nerve action potentials (SNAPs) and thenar M waves were important in localizing the lesion; F-response and somatosensory evoked potential (SEP) studies were of more limited utility. All electrodiagnostic studies were normal in 10 patients with nonneurogenic thoracic outlet syndrome. In traumatic (three patients) or idiopathic brachial plexopathy (five patients), needle EMG was especially helpful but, in the former, SEP studies helped to guide management and, in the latter, to confirm the proximal site of the lesion when peripheral SNAPs were normal. The presence of preserved but small SNAPs but absent M waves in patients with traumatic plexopathies suggested a combined pre- and postganglionic lesion.
我们报告了对23例疑似臂丛神经病变患者进行详细电生理研究的结果。在5例患有神经源性胸廓出口综合征的患者中，针电极肌电图以及尺神经感觉神经动作电位（SNAPs）和大鱼际肌M波大小的测定对病变定位很重要；F波反应和体感诱发电位（SEP）研究的作用较为有限。10例非神经源性胸廓出口综合征患者的所有电诊断研究均正常。在创伤性（3例患者）或特发性臂丛神经病变（5例患者）中，针电极肌电图特别有帮助，但在前者中，SEP研究有助于指导治疗，而在后者中，当外周SNAPs正常时，有助于确认病变的近端部位。创伤性神经病变患者中存在保留但较小的SNAPs但M波缺失提示节前和节后联合病变。
