Axillary Nerve Somatosensory Evoked Potentials in Young Healthy Individuals with Clinical Application
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Objective: To determine the role of somatosensory evoked potential (SEP) study for axillary nerve and confirm clinical usefulness through case studies. Method: Fifteen healthy volunteers were recruited for the axillary nerve SEP study. The stimulation site is located on the posterior edge of the lateral deltoid muscle. The active recording electrode is placed over the contralateral C3’ or C4’ scalp area. Fz was used as the reference. The latency and amplitude of axillary nerve SEP were estimated. SEP data was compared by gender and correlation with height and age was also analyzed. Two patients diagnosed with axillary nerve injury through a nerve conduction study were collected for the axillary nerve SEP. Results: In healthy subjects, N1 latency was 13.8±0.9 msec, and P1 latency was 20.1±1.8 msec. The amplitude was 1.35±0.53 ㎶. The average amplitude difference between right and left sides was 0.26±0.20 uV. In patients with axillary nerve injury, the axillary nerve SEP was found to be absent or significantly reduced in amplitude. Female subjects showed larger amplitudes and shorter N1 and P1 latencies than male subjects. There was no significant correlation between height and SEP data. Conclusion: It is meaningful that our study is the first study to make the normal value of axillary nerve SEP and apply it to patients with axillary nerve injury. The axillary nerve SEP study may be helpful for patients with axillary nerve injury who have discomfort in the shoulder or impaired sensation on the lateral side of the upper arm.
Abstract
Objective: To determine the role of somatosensory evoked potential (SEP) study for axillary nerve and confirm clinical usefulness through case studies. Method: Fifteen healthy volunteers were recruited for the axillary nerve SEP study. The stimulation site is located on the posterior edge of the lateral deltoid muscle. The active recording electrode is placed over the contralateral C3’ or C4’ scalp area. Fz was used as the reference. The latency and amplitude of axillary nerve SEP were estimated. SEP data was compared by gender and correlation with height and age was also analyzed. Two patients diagnosed with axillary nerve injury through a nerve conduction study were collected for the axillary nerve SEP. Results: In healthy subjects, N1 latency was 13.8±0.9 msec, and P1 latency was 20.1±1.8 msec. The amplitude was 1.35±0.53 ㎶. The average amplitude difference between right and left sides was 0.26±0.20 uV. In patients with axillary nerve injury, the axillary nerve SEP was found to be absent or significantly reduced in amplitude. Female subjects showed larger amplitudes and shorter N1 and P1 latencies than male subjects. There was no significant correlation between height and SEP data. Conclusion: It is meaningful that our study is the first study to make the normal value of axillary nerve SEP and apply it to patients with axillary nerve injury. The axillary nerve SEP study may be helpful for patients with axillary nerve injury who have discomfort in the shoulder or impaired sensation on the lateral side of the upper arm.
참고문헌 (15)
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