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Journal of the Korean Academy of Rehabilitation Medicine 1985;9(2):13.
A Clinical Study for the Diagnosis of Carpal Tunnel Syndrome using Somatosensory Evoked Potential Test
Tai Ryoon Han, M.D.
Department of Rehabilitation Medicine, College of Medicine, Seoul National University
체성감각 유발전위(Somatosensory evoked potential)을 이용한 수근터널증후군 진단에 대한 임상적 연구
서울대학교 의과대학 재활의학교실

For the evaluation of severity of involvement in carpal tunnel syndrome patients, who could not be evaluated the severity by ordinary nerve conduction study due to absence of sensory nerve action potential, the somatosensory evoked potential test was done in 14 patients, 20 hands as well as ordinary sensory nerve conduction study.

The results were;

1) In somatosensory evoked potential test for diagnosis of carpal tunnel syndrome, it is suggested that the N1 latency is the most important criterion.

2) The N1 latency over 22.5 msec at index finger stimulation seems to be significant in the diagnosis of carpal tunnel syndrome.

3) Difference over 4.5 msec between the N1 latency at median nerve stimulation and one at index finger stimulation in the same hand seems to be significant in the diagnosis of carpal tunnel syndrome.

4) If the sensory nerve action potential has no response, differences between the N1 latencies at median nerve and index finger stimulation seems to give the information for severity of carpal tunnel syndrome.

Key Words: Carpal tunnel syndrome, Somatosensory evoked potential, Sensory nerve conduction, Median nerve


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