Khosrawi Saeid, Dehghan Farnaz, Shaygannejad Vahid
Department of Physical Medicine and Rehabilitation, Isfahan Neurosciences Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
Department of Neurology, Isfahan Neurosciences Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
Adv Biomed Res. 2015 Jan 30;4:21. doi: 10.4103/2277-9175.150386. eCollection 2015.
Residual latency is the time difference between measured and predicted distal conduction time. We investigated ulnar nerve residual latency in patients with ulnar neuropathy at elbow for the possibility of its clinical utility.
In a cross-sectional study and based on the inclusion and exclusion criteria, ulnar nerve residual latency was calculated by using standard settings in 63 hands of patients who had signs and symptoms suggesting ulnar neuropathy at elbow and 94 healthy hands as the control group.
Mean ulnar nerve residual latency for case and control groups were 1.82 ± 0.45 and 1.59 ± 0.54 ms, respectively, which showed a statistically significant difference (P = 0.01). There was no significant difference in mean ulnar nerve residual latency between males and females and also between right and left hands (P > 0.05). By considering different cut-off points, the sensitivity and specificity of a residual latency of 2.86 ms were 70% and 56%, respectively.
Ulnar nerve residual latency may reflect the effects of an axonal injury at elbow on distal ulnar motor fibers. So, its measurement may help in the diagnosis of ulnar neuropathy at elbow.
残余潜伏期是测量的和预测的远端传导时间之间的时间差。我们研究了肘部尺神经病变患者的尺神经残余潜伏期，以探讨其临床应用的可能性。
在一项横断面研究中，根据纳入和排除标准，对63例有肘部尺神经病变体征和症状的患者的手部以及作为对照组的94例健康手部，使用标准设置计算尺神经残余潜伏期。
病例组和对照组的尺神经平均残余潜伏期分别为1.82±0.45和1.59±0.54毫秒，差异有统计学意义（P = 0.01）。男性和女性之间以及右手和左手之间的尺神经平均残余潜伏期无显著差异（P>0.05）。考虑不同的截断点，残余潜伏期为2.86毫秒时的敏感性和特异性分别为70%和56%。
尺神经残余潜伏期可能反映肘部轴索损伤对尺神经远端运动纤维的影响。因此，测量尺神经残余潜伏期可能有助于诊断肘部尺神经病变。
