Short-latency Somatosensory Evoked Potentials: Studies in Normal Korean Subjects

Keimyung Medical Journal 1986;5(1):37-44.

정상한국인의 단잠복기체감각유발전위에 관한 연구

박영춘; 서정규; 이상도

Abstract

Since the early 1970，evoked potentials (somatosensory evoked potential, SEP； visual evoked potential, VEP and brainstem auditory evoked potential, BAEP) have rapidly developed into useful clinical tools. Now it has been used widely as reliable diagnostic tools in most of neurological service. This study was done in order to have normal data of median, and ulnar nerve somatosensory evoked potentials in our own laboratory. Observations were made on 42 normal Korean volunteers (28 males and 14 females) ranging in age from 13 to 62 years, using Medelec MS6G Type. Stimulating electrodes were placed over the right and left median and ulnar nerves just proximal to the wrist. Stimulation rate; 5/sec, stimulus intensity was adjusted to produce a small twitch of the thumb. Recordings were made from tin disc electrodes(7 mm in diameter) attached to Fz for reference, EP, C2 and Cc (2 cm behind to the C3 or C4 contralateral to the stimulation limb) for recording electrodes. Input from recording electrodes was led to differential amplifiers and the output was summated by averager system and then recorded by X-Y plotter. Analysis time, low filter and high filter are adjusted 50 msc., 10 Hz and 600 Hz respectively, and 1024 responses were summated. Normal SEP responses after median and ulnar nerve stimulations were shown Fig. 1. and Fig. 2. Normal data for median and ulnar nerve SEPs were shown table 1. and table 2. Absolute latencies and amplitudes in each waves (EP, ulnar SEP than median nerve SEP.