Patterns of Uterine Motility In the Normal Ovulatory and Anovulatory Cycle, after Castration, Coitus and Missed Abortion

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Abstract
Uterine contractions were studied by means of an intra-uterine balloon, connected to a mechanical ink recorder. Contractions during the follicular phase in the normal ovulatory cycle were characterized by a rapid rate of 2-3 per min. and low amplitude. Contractions assumed a different pattern several days after ovulation. Under corpus luteum influence the contractions were much higher in amplitude, occurred at a slower rate, about one per min. In a case with confirmed diagnosis of anovulatory cyclic bleeding the contractions throughout the cycle were of the follicular phase type. In one patient who had a bilateral oophorectomy the uterus was quiescent, insensitive to pituitrin, and no contractions could be recorded. After 160,000 I. U. of estrogens intrinsic motility was reestablished and a tetanic response to pituitrin occurred. Following coitus in one case the intrinsic motility was lost but had returned to normal at the end of 18 hrs. In one case of missed abortion with a negative rabbit ovulation test the uterus was quiescent and insensitive to pituitrin. Motility was restored with 40,000 I.U. daily of estrogens and the uterus then reacted to pituitrin and expelled the macerated fetus.

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