Analyzing distal motor and sensory latency of the median nerve in the diagnosis of carpal tunnel syndrome
Main Article Content
Abstract
Diagnosis of carpal tunnel syndrome ( CTS) is based on clinical and electrodiagnostic, in which electrodiagnosis is considered an effective method to help confirm a diagnosis. The objective of this research is to analyze the distal motor and sensory latency of the median nerve in the diagnosis of CTS. We study 532 hands that were diagnosed with idiopathic CTS according to the American Association of Electrodiagnostic criteria, at Dong Do general clinic. Research results show that a prolongation of the distal motor latency is 69.55% and sensation latency is 50.38%. The difference between the sensory latency (DSLd), the motor latency (DMLd) of the median - ulnar nerve has an abnormal rate of 92.23%; 80.83% (p < 0.01), with sensitivity 79.17%; specificities were 87.5% and 93.75%. Especially, when comparing the sensory latency of the median - ulnar nerve in the ring finger was abnormal 94.97% (p < 0.01) with a sensitivity of 97.9%, specificity of 100%. The cut - off point is 0.65; 1.4; 0.45 respectively. The values of distal latency difference of median nerve help early diagnose carpal tunnel syndrome with high sensitivity and specificity.
Article Details
Keywords
Carpal tunnel syndrome ( CTS), electrical diagnosis, distal latency.
References
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