Bhaskar S H, Bhatia B D, Mahadevan S, Thombre D P, Krishnamurthy N
Department of Pediatrics, Jawaharlal Institute of Postgraduate Medical Education and Research, Pondicherry, India.
Electromyogr Clin Neurophysiol. 1997 Jan-Feb;37(1):33-7.
Ten healthy children (Group I), twenty children with acute spinal poliomyelitis (Group II and III) and twenty children of post-polio residual paralysis (Group IV) between the age group of 9 months to 4 years were the study subjects. The motor nerve conduction velocity (MNCV), standardized distal motor latency (SDML) and motor latency (M-RL) were similar in all the groups studied No H-reflex could be elicited in children with acute spinal poliomyelitis seen within one week of onset of paralysis (Group II). The H-max from 4-6 week group (III) improved with time in 9-12 month (Group IV) but did not attain the control (Group I) value. The H-reflex latency (H-RL) which was prolonged in Group III children returned back to normal value in children with residual paralysis (Group IV). The M-max which was significantly reduced in Group II children further decreased in Group III children before showing a significant rise in children with residual paralysis (Group IV). The M-max showed a significant correlation to duration of paralysis during the first week of onset of the disease process and with the muscle power assessed clinically in children with residual paralysis (Group IV). The H/M ratio of children with acute paralysis (Group III) was similar to control while that of residual paralysis was significantly lower in comparison to controls. However, the corrected H/M ratio of children with acute paralysis (Group III) and residual paralysis (Group IV) was significantly lower than the controls. There was significant increase in corrected H/M ratio in group IV children compared to group III.
9个月至4岁的10名健康儿童（第一组）、20名急性脊髓灰质炎患儿（第二组和第三组）以及20名小儿麻痹后遗症患儿（第四组）为研究对象。在所研究的所有组中，运动神经传导速度（MNCV）、标准化远端运动潜伏期（SDML）和运动潜伏期（M-RL）相似。在瘫痪发作一周内就诊的急性脊髓灰质炎患儿（第二组）中未引出H反射。4-6周组（第三组）的H最大值在9-12个月时（第四组）随时间改善，但未达到对照组（第一组）的值。第三组患儿延长的H反射潜伏期（H-RL）在后遗症患儿（第四组）中恢复到正常值。第二组患儿显著降低的M最大值在第三组患儿中进一步降低，然后在后遗症患儿（第四组）中显著升高。M最大值与疾病过程发作第一周的瘫痪持续时间以及后遗症患儿（第四组）临床评估的肌力显著相关。急性瘫痪患儿（第三组）的H/M比值与对照组相似，而后遗症患儿的H/M比值与对照组相比显著降低。然而，急性瘫痪患儿（第三组）和后遗症患儿（第四组）的校正H/M比值显著低于对照组。与第三组相比，第四组患儿的校正H/M比值显著增加。
