Establishment of the normative ranges for nerve conduction values of distal compound muscle action potential / 西安交通大学学报(医学版)

ABSTRACT

Objective To establish the normative ranges for nerve conduction values of distal compound muscle action potential(CMAP) latency and amplitude and to provide evidence for diagnosing peripheral neuropathy.Methods A total of 245 normal volunteers were recruited,and nerve conduction study was carried out on median nerve,ulnar nerve,tibial nerve and peroneal nerve.The distal latency and amplitude were analyzed.The data collected were tabulated and analyzed based on age,sex and weight in the EXCEL and SPSS systems.Results Gender,weight and sidedness had no effects on CMAP distal latency and amplitude.However,age had a significant effect on CMAP amplitude and median nerve distal latency.This age effect was more obvious for people around 40 years old.Distal latency was prolonged and amplitude was decreased with age increasing.Conclusion It is reasonable and clinically practicable to establish the normative ranges of distal CMAP according to two age groups above and below 40 years old.