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Journal of the Korean Academy of Rehabilitation Medicine 1998;22(1):148-152.
Median Motor Nerve Conduction and H-reflex Studies in Premature Infants.
Kim, Sei Joo , Park, Youn Hyung , Lee, Eun Ha , Song, Eun Bum , Kim, Woo Sub , Na, Jin Kyung , Lee, Sang Hun
Department of Rehabilitation Medicine, Korea University College of Medicine.
미숙아의 정중운동신경 전도속도 및 H-반사 잠시에 관한 연구
김세주, 박윤형, 이은하, 송은범, 김우섭, 나진경, 이상헌
고려대학교 의과대학 재활의학교실

Many factors have been identified which to affect the rate of propagation of impulses along motor fibers. These include temperature changes around the nerve, diameter of the axon, degree of myelinization, age of infants, and local environment of the nerve. Motor nerve conduction velocity and Hoffman's reflex latency have been used to assess the degree of myelination and maturation of the nervous system. The conduction velocities in infants of a short gestational age are significantly lower than those of the fullterm infants. The extrauterine myelination and maturation might increase nerve conduction velocity. We measure the median motor nerve conduction velocity, compound muscle action potentials amplitude and H-reflex latency of premature infants to determine the neurological maturation after birth. The premature infants with gestational age above 37 weeks have a significantly higher conduction velocity and a shorter H-reflex latency than those of gestational age below 37 weeks. The premature infants with weight over 2.5 kg have a significantly higher conduction velocity, larger compound muscle action potentials amplitude and a shorter H-reflex latency than those of weight below 2.5 kg. And there is a statistically significant negative correlation of the H-reflex latency with the postmenstrual age. The determination of motor nerve conduction velocities and H-reflex latencies seem to be an additional method in assessing the degree of maturity in infants after birth.

Key Words: Median nerve, Motor conduction, H-reflex, Prematurity, Postmenstrual age


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