Abstract
Background: The normal values of nerve conduction studies are extremely important to differentiate abnormal situations. Aim: We wanted to revise normal values and compare the results in between different age and gender groups. Methods: In this study, 120 people (240 hands) aged between 15 and 74 who had no complaints, prior surgery or trauma of upper extremities underwent nerve conduction studies concerning median and ulnar nerves with standard methods. The parameters used were antidromic median sensory nerve conduction velocity (SNCV) between wrist-Ist, wrist-IIIrd digit, wrist-palm segmet; ulnar SNCV between wrist-Vth digit, motor nerve conduction between wrist and elbow for median and ulnar nerves and sensory nerve action potential amplitudes (SNAP), interpeak latency difference. Skin temperature was controlled. All NCVs adjusted to 35.5 C arbitrarily which was found to be highest degree among the examined cases.The parameters were statistically analysed, compared between age and gender groups. Group I consisted of patients aged 15–49, Group II 50–74. Results: The amplitude differences of both sensory and motor action potentials in between age and gender groups were the most impressive ones. When age groups were compared all amplitudes were smaller in the group II (p = 0.000). In females all SNAPs were larger in amplitude than males (p = 0.000). Although there were some NCV differences between male and female groups, most of them were minor and did not persist in different age groups. The NCV differences between age groups were statistically significant disclosing a slowing of NCV in group II. This change was statistically much more prominent and in females (p = 0.000). Conclusion: Even the nerve conduction velocity studies are very simple tests compared to recent sophisticated electrophysiologic techniques, they are used more widely than any other in daily practise. It should be kept in mind that all normal values highly differ according to age and gender.
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