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KMID : 0361420160400010050
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Journal of Korean Academy of Rehabilitation Medicine
2016 Volume.40 No. 1 p.50 ~ p.55
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Diagnostic Value of the Second Lumbrical-Interosseous Distal Motor Latency Comparison Test in Severe Carpal Tunnel Syndrome
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Lee Sang-Hun
Kim Dong-Hyun
Cho Hee-Mun
Nam Ho-Sung
Park Dong-Sik
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Abstract
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Objective: To examine the usefulness of the second lumbrical-interosseous (2L-INT) distal motor latency (DML) comparison test in localizing median neuropathy to the wrist in patients with absent median sensory and motor response in routine nerve conduction studies.
Methods: Electrodiagnostic results from 1,705 hands of patients with carpal tunnel syndrome (CTS) symptoms were reviewed retrospectively. All subjects were evaluated using routine nerve conduction studies: median sensory conduction recorded from digits 1 to 4, motor conduction from the abductor pollicis brevis muscle, and the 2L-INT DML comparison test.
Results: Four hundred and one hands from a total of 1,705 were classified as having severe CTS. Among the severe CTS group, 56 hands (14.0%) showed absent median sensory and motor response in a routine nerve conduction study, and, of those hands, 42 (75.0%) showed an abnormal 2L-INT response.
Conclusion: The 2L-INT DML comparison test proved to be a valuable electrodiagnostic technique in localizing median mononeuropathy at the wrist, even in the most severe CTS patients.
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KEYWORD
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Carpal tunnel syndrome, Nerve conduction, Second lumbrical-interosseous distal motor latency comparison test
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