| Dorsal Ulnar Cutaneous Nerve Conduction Study in Entrapment Ulnar Neuropathy at the Elbow. |
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Kwon, Hee Kyu , Lee, Hang Jae , Lee, Sang Ryong , Park, Yoon Kun |
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Department of Rehabilitation Medicine, Korea University College of Medicine, Korea. drason0615@hanmail.net |
| 주관절부 척골 신경병증에서 배측척골피부 신경전도 검사 |
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권희규, 이항재, 이상룡, 박윤근 |
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고려대학교 의과대학 재활의학교실 |
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| Abstract |
Objective
To evaluate the electrophysiologic findings of the dorsal ulnar cutaneous nerve (DUCN) in ulnar neuropathy at the elbow and to correlate the sensory nerve action potential (SNAP) amplitude of DUCN to those of ulnar compound muscle action potential (CMAP) and SNAP.
Method
The subjects were 39 patients diagnosed as ulnar neuropathy at the elbow. Electrophysiologic classification consisted of 3 groups: conduction block (CB); conduction block and axonal degeneration (CBAD); axonal degeneration (AD). Findings of DUCN conduction study were evaluated according to the electrophysiologic classification. The amplitude of DUCN was correlated to those of CMAP and SNAP.
Results
The DUCN conduction study was normal in all cases of CB (4 cases), but was abnormal in 21 cases of CBAD (23 cases) and in 10 cases of AD (12 cases). Even in the cases with AD, 4 cases showed normal DUCN potentials. Correlations of DUCN to ulnar SNAP and CMAP were r=0.48, (p＜0.01) and r=0.33, (p＜0.05), respectively.
Conclusion
Findings of DUCN may be related to the fasc icular involvement of the ulnar nerve at the elbow. Although it is possible for the DUCN to be spared in ulnar neuropathy at the elbow, electrophysiologic measurement of the DUCN response remains useful, but only in those cases where it is abnormal, which suggests the lesion to be at a more proximal site. (J Korean Acad Rehab Med 2004; 28: 232-235) |
| Key Words:
Dorsal ulnar cutaneous nerve, Axon, Compound muscle action potential, Sensory nerve action potential |
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