Studies on Electrohysterogram

Abstract

The electrohysterography by means of an extracellular electrode is expected to be a useful method to disclose functional disorders of the uterine muscles. To find the basic patterns in the electrohysterogram of the rat's uterus, the reaction of the organ was studied after the administration of estradiol, estriol, progesterone or estradiol plus progesterone. Studies were also made on the uterus after castration and in pregnancy, parturition and puerperium. The electrohysterograms obtained in our experiments with rats could be classified into three types of ED, ET and P. The condition of the uterine muscles could be inferred from the analysis of the wave form, amplitude, interval diagram, interval of the bursts, number of the spike discharge, propagation velocity and conductivity on the electrohysterogram. The characteristic pattern of parturition was reproduced with estriol and posterior pituitary hormone better than with other hormones. The finding was of interest in understanding the mechanism of labor in association with electrohysterography.