Krarup C, Sethi R K
Department of Medicine, Brigham and Women's Hospital, Boston, MA 02115.
Electroencephalogr Clin Neurophysiol. 1989 Mar;72(3):259-67. doi: 10.1016/0013-4694(89)90251-4.
A 24-year-old male with idiopathic acute aching of the right wrist, weakness of ulnar innervated muscles of the forearm and hand, and numbness of the ulnar two digits, was examined electrophysiologically. Conduction studies showed almost complete conduction block of motor fibers of the ulnar nerve distally in the brachial plexus. Sensory fibers were less affected. The symptoms and pathophysiological findings improved over a period of 1-2 months and were normal at the final study performed 7 months after presentation. There was mild evidence of chronic partial denervation of the abductor digiti V and the flexor digitorum profundus of the two ulnar digits. There were additional mild EMG changes of the abductor pollicis muscle indicating minor involvement of the median nerve. There was no traumatic or other obvious cause for these findings. It is suggested that the patient had a mild and abortive form of brachial plexus neuropathy presenting as a demyelinating lesion rather than the more typical wallerian degeneration seen in most established cases.
一名24岁男性，出现右腕部特发性急性疼痛、前臂和手部尺神经支配肌肉无力以及尺侧两指麻木，接受了电生理检查。传导研究显示，尺神经运动纤维在臂丛神经远端几乎完全传导阻滞。感觉纤维受影响较小。症状和病理生理表现经过1至2个月有所改善，在就诊7个月后进行的最终检查时恢复正常。有轻度证据表明小指展肌和尺侧两指的指深屈肌存在慢性部分失神经支配。拇短展肌还有额外的轻度肌电图改变，提示正中神经有轻微受累。这些表现没有创伤性或其他明显原因。提示该患者患有轻度且呈顿挫型的臂丛神经病变，表现为脱髓鞘病变，而非大多数典型病例中所见的更典型的华勒氏变性。
