Landau Mark E, Diaz Myrna I, Barner Kristen C, Campbell William W
Department of Neurology, Walter Reed Army Medical Center, 6900 Georgia Avenue, Washington, DC 20307, USA.
Muscle Nerve. 2002 Dec;26(6):838-40. doi: 10.1002/mus.10259.
One diagnostic criterion for ulnar nerve mononeuropathy at the elbow (UNE) is a decrease in across-elbow nerve conduction velocity (NCV) > 10 m/s compared to the forearm segment. Distance and latency measurement errors are an inherent part of NCV calculations. Twenty electromyographers measured the latencies of stored ulnar compound muscle action potentials and measured the forearm and across-elbow distances along the ulnar nerve. Based on previously published equations, experimental error in NCV was calculated for various NCVs. The mean distances and standard deviations for the forearm and elbow segments were 212.5 +/- 2.1 mm and 86.7 +/- 4.2 mm, respectively. For an NCV of 55 m/s, a difference of 14 m/s between the two segments can occur from measurement error alone. Distance measurements about the elbow are fraught with interobserver errors rendering the resultant NCV of that segment of limited value as a sole criterion for the diagnosis of UNE.
肘部尺神经单神经病（UNE）的一项诊断标准是，与前臂段相比，肘部神经传导速度（NCV）降低超过10 m/s。距离和潜伏期测量误差是NCV计算中固有的一部分。20名肌电图检查人员测量了存储的尺神经复合肌肉动作电位的潜伏期，并测量了沿尺神经的前臂和肘部距离。根据先前发表的公式，计算了不同NCV时的NCV实验误差。前臂段和肘部段的平均距离及标准差分别为212.5±2.1 mm和86.7±4.2 mm。对于55 m/s的NCV，仅测量误差就可能导致两段之间出现14 m/s的差异。肘部周围的距离测量存在观察者间误差，使得该段所得的NCV作为UNE诊断的唯一标准价值有限。
