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Journal of the Korean Academy of Rehabilitation Medicine 1998;22(3):658-664.
The Diagnostic Significance of H Reflex and Somatosensory Evoked Potential in S1 Radiculopathy.
Lee, Seong Jae , Hyun, Jung Keun , Chung, Sun Gun
1Department of Rehabilitation Medicine, College of Medicine, Dankook University.
2Department of Rehabilitation Medicine, Seoul National University.
제 1 천수신경근병증에서 H 반사와 체성감각유발전위의 진단적 가치
이성재, 현정근, 정선근1
단국대학교 의과대학 및 1서울대학교 의과대학 재활의학교실
Abstract

Objective
To compare the diagnostic significance of H reflex and somatosensory evoked potential(SEP) in the diagnosis of S1 radiculopathy, and to explore the possible interpretations on the discrepancies of the test results.


Method
Twenty-eight patients who were diagnosed as a S1 radiculopathy by the clinical and radiological correlations, and thirty-five controls with no evidence of S1 radiculopathy by the clinical or radiological studies were studied by the H reflex, sural SEP, and needle electromyography.


Results
The sensitivity of H reflex study was 64% for the S1 radiculopathy, and the specificity was 86%. The sensitivity and the specificity of the sural SEP study for the S1 radiculopathy were 50% and 80% respectively. Within 1 month from the onset, the sensitivity of H reflex increased to 75%. The needle electromyography showed 19% for the sensitivity and 100% for the specificity. The probability of the S1 radiculopathy was 70% in 10 cases who had the abnormal H reflex and normal SEP values and 36% in 8 cases who had the normal H reflex and abnormal SEP values.


Conclusion
H reflex study was the most sensitive test in the electrodiagnosis of the S1 radiculopathy and the electrodiagnostic significance of sural SEP was obscure.

Key Words: S1 Radiculopathy, H reflex, Somatosensory evoked potential, Electromyography


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