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KMID : 0860920070090010012
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Journal of the Korean Association EMG-Electrodiagnostic Medicine
2007 Volume.9 No. 1 p.12 ~ p.17
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Interexaminer Repeatability of Three Ulnar Nerve Conduction Studies
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Cho Hyung-Jun
Cho Dong-Soo
Park Seung-Buhm
Yoon Soe-Ra
Jung Kwang-Ik
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Abstract
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Objectives: The purpose of this study was to determine the interexaminer repeatability of three ulnar nerve conduction studies in healthy adults.
Methods: We performed three ulnar nerve conduction studies in 30 healthy adults. Their mean age(years) was 58.5¡¾16.7. The ulnar motor conduction, antidromic sensory conduction and mixed nerveconduction study were performed. The motor conduction velocities were obtained in below elbow to wrist (BE-to-W), above elbow to below elbow (AE-to-BE), axilla to above elbow (AX-to-AE) segments and antidromic sensory NCV were calculated in Wrist to 5th digit (W-to-5th D), below elbow to wrist (BE-to-
W), above elbow to below elbow (AE-to-BE) segments. The mixed latency difference between median and ulnar nerve was also obtained. The measurement was repeated by two examiners. A second examiner was blinded to the results of the first examiner. We analyzed data through the intraclass correlation coeffi- cient (ICC) and the coefficient of repeatability (CR) for evaluate interexaminer repeatability.
Results: In ulnar motor nerve conduction study, the ICC was 0.903 for the BE-to-W, 0.813 for the AE-to-BE, 0.649 for AX-to-AE. The CR was 6.0 m/s for the BE-to-W, 12.7 m/s for the AE-to-BE, 11.6 m/s for AX-to-AE. In ulnar sensory nerve conduction study, the ICC was 0.787 for W-to-5th D, 0.805 for BE-to-W, 0.881 for AE-to-BE. The CR was 9.7 m/s for W-to-5th D, 8.8 m/s for BE-to-W, 11.4 m/s for AE-to-BE. In mixed nerve conduction study, the ICC was 0.546. The CR was 0.66 ms.
Conclusion: The reliability of interexaminer repeatability was above fair to good in three ulnar nerve con-duction studies. However, the reliability of the interexaminer repeatability in mixed nerve conduction study was relatively lower than in other conduction studies. Therefore, a moderate amount of interexaminer vari- ability must be taken into account using mixed latency difference between median and ulnar nerve and
through this study the interexaminer variability should be considered in nerve onduction studies.
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KEYWORD
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Ulnar motor conduction study, Antidromic ulnar sensory nerve conduction study, Mixed
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