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J Korean Assoc EMG Electrodiagn Med 2003;5(1):21-27.
Published online May 10, 2003.
Clinical Relevance of Median Nerve SEP among Hemiplegic Patients with Stroke
Abstract
Objectives: To describe the relationship between median nerve somatosensory evoked potential (SEP) and clinical measures of motor and sensory impairments in hemiparetic upper extremity. Methods: Twenty-two stroke patients underwent SEP assessments by stimulations of proximal and distal parts of both median nerves. SEPs were recorded over 5 sites over both hemispheres. Absolute latencies of N1, P1 and amplitude of N1/P1 were measured. Upper limb motor impairment was assessed with the Fugl-Meyer Motor Assessment (FMA). Sensory function measure includes proprioception and light touch sense in proximal and distal segments of the upper limb. Results: Time interval after stroke onset was 4.3 7.2 months on the average. Distal SEP amplitude significantly correlated with proprioception of distal segment of upper limb. There were wide differences of the distribution of recording sites showing significant correlation according to dominancy of affected hemisphere. However, there was no significant correlation between SEP parameters and FMA score of the affected upper extremity. Presence of proximal SEPs correlated with level of light touch sense of proximal arm, but not proprioceptive function. Conclusion: Close relationship of SEP to proprioception was apparent and can be affected by hemisphere dominancy. These results demonstrate that asymmetry of neural generator distributions between hemisphere can be presumed.
Key Words: Somatosensory evoked potential, Stroke, Clinical relevance


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