Volume 28, Issue 1 (1-2014)                   Med J Islam Repub Iran 2014 | Back to browse issues page

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Eftekharsadat B, Ahadi T, Raissi G R, Kazem Shakoory S, Fereshtehnejad S M. Validity of current electrodiagnostictechniques in the diagnosis of carpal tunnel syndrome. Med J Islam Repub Iran. 2014; 28 (1) :276-282
URL: http://mjiri.iums.ac.ir/article-1-2318-en.html
Physical Medicine and Rehabilitation Department, Iran University of Medical Sciences, Tehran, Iran. , tannaz.ahadi@yahoo.com
Abstract:   (2532 Views)

  Background : Determining the validity of current median sensory nerve conduction techniques for diagnosis of carpal tunnel syndrome (CTS).

  Methods: Eighty five patients with clinical diagnosis of CTS were compared with the same number of healthy people. The validity of electrodiagnostic tests were compared in a case-control manner. These electrodiagnostictechniques included long-segment, short-segment, 2-segment and relative slowing studies as well as disto-proximal ratio. Receiver Operating Characteristic (ROC) curve employed for comparison, determining the optimal cut-off points for each test. Validity was evaluated with likelihood ratio.

  Results: Likelihood ratio (LHR) for Radial-median sensory latency difference was ∞, while LHR for ulnar-median sensory latency difference was 16.9. Sensitivity of Two-segment method was 98.8% and mixed palm-wrist median Nerve Conduction Velocity (NCV) study showed a sensitivity and specificity of 97.6%, 83.5% respectively.

  Conclusions : Radial-median latency difference study (optimal cut-off point ≥0.5) and study of wrist-segment NCV (optimal cut-off point <50.45) were the most valuable techniques in diagnosis of CTS, respectively. Median-ulnar latency difference study and disto-proximal ratio study had more diagnostic implication than long and short (mixed) segment technique in this regard.

 

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