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KMID : 0860920100120010032
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Journal of the Korean Association EMG-Electrodiagnostic Medicine
2010 Volume.12 No. 1 p.32 ~ p.38
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Involvement of Distal Ulnar Nerve in Carpal Tunnel Syndrome
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Kim Seon-Nyeo
Lee Seung-Hwa
Kim Kyung-Lyul
Jang Chul-Ho
Park Young-Ok
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Abstract
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Objectives: To investigate involvement of ulnar sensory nerve that can be cause of the extra-median spread of sensory symptoms in carpal tunnel syndrome (CTS) patients.
Methods: Forty two hands (mean age 60.5 years) with established diagnosis of CTS patients and twenty one hands with healthy controls were included in this study. Patients were categorized into 3 subgroups by distribution of paresthesias: median, glove and all-fingers. We categorized the severity of symptom into 2 subgroups according to Simovic clinical scale and divided the electrodiagnostic severity into 3 classes by Stevens classification. We examined ulnar sensory nerve conduction with 4th and 5th finger recordings (U4, U5) and conduction parameters of the dorsal ulnar cutaneous nerve.
Results: There were no significant differences in ulnar nerve conduction parameters between CTS and control group. But, in patients who had extra-median (glove or all-fingers) symptoms, U4 and U5 amplitudes were significantly lower than those of patients with median symptoms. And the U4 and U5 amplitudes decreased with increasing the CTS severity.
Conclusion: The results provided possible evidence of sensory fiber involvement to the ulnar nerve at the wrist in patients with severe CTS or extra-median sensory symptoms.
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KEYWORD
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Carpal tunnel syndrome, Nerve conduction studies, Ulnar nerve
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