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Comparison of the modified method and the median sensory-ulnar motor latency difference in the diagnosis of carpal tunnel syndrome

      Highlights

      • The modified method was calculated based on the results of the classic nerve conduction study.
      • The modified method had more sensitivity and specificity in diagnosing CTS than the MSUMLD.
      • The modified method may diagnose mild and moderate CTS with high sensitivity and specificity.
      • The modified method may not be affected by age, height, weight, hand temperature, and sex.
      • The modified method may be easily applied in different laboratories and countries.

      Abstract

      Objectives

      This study aimed to compare the modified method and the median sensory-ulnar motor latency difference in the diagnosis of carpal tunnel syndrome.

      Methods

      The study recruited the electromyography results of 105 hands of 60 patients who had a complaint of carpal tunnel syndrome (CTS) on the hand diagram. The average sensory-ulnar motor delay difference (MSUMLD) was determined by simple subtraction, and the modified method was calculated based on the results of the classic method. The modified method and the MSUMLD were compared according to their sensitivity and specificity in the diagnosis of CTS.

      Results

      In this study, 54 hands were evaluated with a unilateral nerve conduction study (45 right; 9 left). A total of 23 hands with CTS and 31 hands without CTS were diagnosed electrophysiologically. The MSUMLD had 91.3% sensitivity and 93.5% specificity; however, the modified method showed 95.7% sensitivity and 96.8% specificity in the diagnosis of CTS. Moreover, the modified method had 100% sensitivity and specificity in the diagnosis of moderate CTS.

      Conclusions

      The modified method may have higher diagnostic accuracy than the MSUMLD for diagnosing CTS.

      Keywords

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