SOMATOSENSORY EVOKED POTENTIALS from the THREE BRANCHES of the TRIGEMINAL NERVE and CLINICAL CORRELATION
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Objective : To obtain the reference value of latency on each branch in a trigeminal nerve SEP study and to apply the SEP values in patients with injury of a specific branch of trigeminal nerve. Method: Sixteen healthy volunteers and four patients with a specific branch of trigeminal nerve injury were enrolled at SEP study. A stimulation site was determined based on the most reliable waveform found according to the path of each branch of trigeminal nerve. Results: In healthy subjects, latencies for right N1, P1 were 11.6±2.4, 15.0±2.2 for V1, 12.2±1.5, 16.0±2.1 for V2, 12.4±2.2, and 16.3±2.4 msec for V3 branch of trigeminal SEP. Moreover, the latency for left N1, P1 were 11.3±2.5, 14.7±2.4 for V1, 12.9±2.1, 15.6±2.0 for V2, and 13.1±1.9, 16.7±2.4 msec for V3 branch of trigeminal SEP. The R-L difference of latency was not significant (p>0.05). Four patients revealed abnormal latencies in the site of their lesion. Conclusion: This was the study charting reference values of each branch of the trigeminal SEP and applying it to the patients with trigeminal nerve injury. The injury to a specific branch of trigeminal nerve can be assessed by a SEP study using each branch of the trigeminal nerve.
Abstract
Objective : To obtain the reference value of latency on each branch in a trigeminal nerve SEP study and to apply the SEP values in patients with injury of a specific branch of trigeminal nerve. Method: Sixteen healthy volunteers and four patients with a specific branch of trigeminal nerve injury were enrolled at SEP study. A stimulation site was determined based on the most reliable waveform found according to the path of each branch of trigeminal nerve. Results: In healthy subjects, latencies for right N1, P1 were 11.6±2.4, 15.0±2.2 for V1, 12.2±1.5, 16.0±2.1 for V2, 12.4±2.2, and 16.3±2.4 msec for V3 branch of trigeminal SEP. Moreover, the latency for left N1, P1 were 11.3±2.5, 14.7±2.4 for V1, 12.9±2.1, 15.6±2.0 for V2, and 13.1±1.9, 16.7±2.4 msec for V3 branch of trigeminal SEP. The R-L difference of latency was not significant (p>0.05). Four patients revealed abnormal latencies in the site of their lesion. Conclusion: This was the study charting reference values of each branch of the trigeminal SEP and applying it to the patients with trigeminal nerve injury. The injury to a specific branch of trigeminal nerve can be assessed by a SEP study using each branch of the trigeminal nerve.
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