The objective of this study was to standardize the technique, increasing the clinical significance of the nerve conduction study in median and ulnar motor and sensory nerves.

At first we found the stimulating point that the muscle action potentials or nerve action potentials are most definitely elicited after stimulating to the median and ulnar nerves at the wrist in 44 healthy Korean adults aged from 20 to 49 years. And then we measured the conduction distance from the stimulating cathode at the wrist to the active recording electrode in the hand muscle or the finger in the median and ulnar nerves respectively.

The mean values of the conduction distance in median and ulnar motor nerves were 6.0±0.60 cm and 5.3±0.54 cm respectively. The mean values of that in median and ulnar sensory nerves were 13.3±1.12 cm and 11.6±0.82 cm respectively, too.

There was statistically significant correlation between the height of the volunteer and the conduction distance in median and ulnar, motor and sensory nerves(p<0.01).

There are two kinds of techniques in placement of stimulating and recording electrodes for the determination of distal latency of peripheral nerve; one method using anatomical landmark, the other utilizing premeasured distance between two electrodes.

The purpose of this study was to determine normal values of the distal latency of the median and ulnar nerve performing by two methods, and was find out their correlations.

Seventy six healthy adults, 39 males and 40 females were examined. Distal latency and active potential amplitude of the median and ulnar nerve of both hands were performed twice according to two techniques in all subjects. In first exam(Anatomical Landmark Group): Stimulating surface electrodes were placed to the proximal wrist crease across the lateral border of the floxor carpi ulnaris tendon for the ulnar nerve.

Recording electrodes were placed over the thenar eminence at midpoint of the line which is drawn between the stimulating site and the midportion of the flexor crease of metacar-pophalangeal joint of the thumb for the median motor distal latency, and were placed over the hypothenar eminene one half way between stimulating site and the distal palmar crease across the ulnar border of the hand for the ulnar motor distal latency. For the distal sensory latency, surface ring electrodes were placed at the proximal interphalangeal joint of the index finger for the median nerve and little finger for the ulnar nerve.

In second exam(Premeasured Group): Recording, reference and ground electrodes were placed at the same site of anatomical landmark group. However, stimulating electrode was placed at the lateral border of the palmaris longus tendon, 7 cm proximal to recording electrode for median distal motor and 14 cm for sensory latency, respectively. For the ulnar distal motor and sensory latency, placing stimulating electrodes also 7 cm and 14 cm proximal to recording electrode at the lateral border of the flexor carpi ulnaris tendon, respectively.

The results were as follows:

1) In anatomical landmak group, the distances between the stimulating and recording electrodes for the median and ulnar distal motor latency were 5.36±0.64 cm, and 5.22±0.63 cm, respectively and 13.38±1.19 cm, and 11.59±1.23 cm for median and ulnar distal sensory latency, respectively.

2) In anatomical landmak group, the mean values of median and ulnar distal motor were 2.86±0.27 msec and 2.39±0.28 msec, respectively and 2.98±0.30 msec and 2.73±0.28 msec, for median and ulnar distal sensory latency, respectively.

3) In premeasured group, the mean values of median and ulnar distal motor latency were 3.19±0.27 msec, and 2.67±0.24 msec, respectively, and 3.10±0.23 msec, and 3.12±0.23 msec for median and ulnar distal sensory latency, respectively.

4) In premeasured group, the mean differences of distal motor and sensory latency between the median and ulnar nerves were 0.47±0.30 msec and 0.26±0.21 msec, respectively.

5) The mean values of median and ulnar distal motor and sensory latency in anatomical landmark group were shorter than those in premeasured group.

6) There were no significant differences of median and ulnar distal latency between sex and age, and no remarkable differences of action potential amplitude between median and ulnar nerve were observed.

Antidromic sensory conduction measurements of median nerve in the forearm of 26 men were performed at intervals before and for 15 minutes following ultrasonic application over a segment of the nerve.

The ultrasound(Us) was applied over the area of the median nerve for 8 minutes at a frequency of 1 MHZ. continuous wave and using 1.5 watt/sq cm² dosage.

Nerve bed temperature was continuously monitered during the study via a subcutaneous needle(26 Gauze, 3 cm) thermistor probe.

Also infrared was irradiated to 26 healthy subject, from the height 75 cm for 8 minutes and after then, the subcutaneous temperature and median nerve conduction latency was measured. Continuous Us and infrared irradiation treatment were associated with increased temperature(0.8^oC) and shortened latendy(0.1 msec, 0.09 msec, respectively), namely similar lavels and patterns for NCV and subcuraneous tissue temperature were observed for the the continuous Us and infrared radiation.

It was concluded that the mechanical effects of Us were not significantly operative in this study. The increased velocities associated with continuous Us and infrared radiation treatments were attributed to a thermal-heating effect.

This is to reveal the normal variations of decrement or increment of potentials in the low rate repetitive stimulation test which was introduced by Desmedet in 1973.

12 healthy Koreans ranging in age between 25 and 28 were used.

The procedure and results obtained were summarized as follows:

1) The setting of EMG machine(BASIS O.T.E.) was in 5ms and 5~10 mV/div. and the repetitive stimulation program was used.

2) The surface electrodes were attached to abductor digiti quinti muscle of dominant hand and supramiximal stimulations were applied to the ulnar nerve at the wrist with fixation of the electrodes and hand as possible.

3) 5 times procedures were performed with 8 sequential stimulation in 3 Hz and taken rests for 30 second between the procedures.

4) The differences between the 1st and 5th potential in percentage were estimated.

5) The mean value of differences was 2.9% increment, with ranging in distribution from 8.3% decrement to 12.9% increment and the standard deviation was 3.0.

한국인 척수손상장애자에게서의 심부정맥혈전증 발생율은 아주 드문 것으로 대개의 임상가들에게는 알려져 왔다. 그러나 일반적 견해로는, 척수장애자들에게는 마비된 하지 내의 정맥 벽과 판에에 영구손상이 서서히 나타날 가능성이 많고 그로인한 정맥내 혈전증의 위험성이 대단히 높다. 최근에 한국여성 척수장애자에게서 심한 심부정맥혈전증을 경험하였기에 그 임상예를 보고한다.

Spinal accessory nerve palsy involving both sternocleidomastoid and trapezius is rare.

This paper will report the case history of a 27yr old man who has developed muscle weakness in shoulder elevation following after fall down.

Manual muscle examination and electrodiagnostic examination indicated the spinal accessory nerve palsy.

During the period of 1972 through March 1985, 235 cases of the diagnosed polyneuropathy in EMG room of Hanyang University Hospital were analysed for causes or associated conditions. Age of polyneuropathy cases was varied frome 1 to 79 and mean age was 39 and male female ratio was 2.7:1.

The most frequent cause was Guillain-Barre syndrome(23.4%) and the next frequent cause was diabetes mellitus(15.7%). Alcoholic neuropathy became the third(10.2%) and toxic neuropathy became the fouth(6.8%). Cause undertermined was 30.6%.

In Guillain-Barre syndrome, nerve involvement of each extremities which was revealed in EMG, upper and lower extremities involvement was in 69.1%. In diabetes mellitus, lower extremities involvement was in 62.2% and upper and lower extremities involvement was in 37.8%. In alcoholic neuropathy, lower extremities involvement was in 79.2% and upper and lower extremities involvement was in 20.8%. In toxic neuropathy, upper and lower extremities involvement was in 75.0%, upper extremities involvement was in 18.7% and lower extremities involvement was in 6.3%.