Kothari M J, Preston D C
Division of Neurology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115.
Muscle Nerve. 1995 Mar;18(3):336-40. doi: 10.1002/mus.880180312.
Electrophysiologic localization of ulnar neuropathy at the elbow often depends on demonstration of segmental slowing. Based on normative data obtained from 50 control subjects, we compared the utility of flexed and extended elbow positions in demonstrating focal slowing at the elbow as compared to the forearm segment in patients with ulnar neuropathy. We studied 35 patients with ulnar neuropathy with definite electrophysiologic localization to the elbow segment defined by conduction block across the elbow segment or by focal slowing demonstrated either in the flexed or extended position. Applying cutoff values from the control group, all 35 patients demonstrated focal slowing at the elbow in the flexed position, whereas only 5 of 35 (14%) patients did so in the extended position. We conclude that the flexed elbow position is more sensitive than the extended position in localizing ulnar neuropathy at the elbow and should be the preferred method when performing ulnar motor conduction studies.
肘部尺神经病变的电生理定位通常依赖于节段性减慢的证实。基于从50名对照受试者获得的正常数据，我们比较了屈肘和伸肘位在显示尺神经病变患者肘部与前臂节段相比局灶性减慢方面的效用。我们研究了35例经明确电生理定位为肘部节段病变的尺神经病变患者，其病变定义为跨过肘部节段的传导阻滞或在屈肘或伸肘位显示的局灶性减慢。应用对照组的临界值，所有35例患者在屈肘位时肘部均显示局灶性减慢，而35例患者中只有5例（14%）在伸肘位时如此。我们得出结论，在肘部尺神经病变定位方面，屈肘位比伸肘位更敏感，在进行尺神经运动传导研究时应作为首选方法。
