Bersnev V P
Zh Vopr Neirokhir Im N N Burdenko. 1979(1):42-8.
The "strength-duration" curve was studied in 154 patients in different periods after injury to the median nerve, ulnar nerve or both nerves. The most probable mean values of strength (U) in changes of the duration (t) of the current 1--6, 7--11 months and more than 12 months after injury were obtained by means of the equation U=a0 + a1t +a2t2 by the least squares method. It was established that the excitability of muscles diminishes continuously but persists more than 15 years after total anatomical interruption of the nerve. Absence of electroexcitability of the forearm muscles as a result of ischemia is not a contraindication for nerve suturation. Suturation of the nerve leads to restoration of sensibility and active contractions of the hand muscles. The deviations in the "strength-duration" curve are signs of partial injury to the nerve. It was found that the more the number of deviations in the "strength-duration" curve and the more its left part on the side of the injury resembles the curve recorded from the symmetrical healthy muscle, the more rapidly is the nerve conduction restored and the more rapidly it improves after nonoperative treatment.
对154例正中神经、尺神经或二者均损伤后的不同时期患者进行了“强度-时间”曲线研究。通过最小二乘法，利用方程U = a0 + a1t + a2t2得出了损伤后1 - 6个月、7 - 11个月以及超过12个月时，电流持续时间（t）变化中最可能的强度均值（U）。研究发现，肌肉兴奋性持续降低，但在神经完全解剖学中断后，这种情况会持续超过15年。前臂肌肉因缺血而无电兴奋性并非神经缝合的禁忌症。神经缝合可恢复感觉并使手部肌肉产生主动收缩。“强度-时间”曲线的偏差是神经部分损伤的迹象。研究发现，“强度-时间”曲线的偏差越多，且损伤侧曲线左侧部分越接近对称健康肌肉记录的曲线，神经传导恢复得越快，非手术治疗后改善也越快。
