Effect of mifegin on the content of cyclic nucleotides in the cervical myometrium in full-term pregnancy.

Cervical myometrium was examined in 22 pregnant women at 39-41 weeks gestation at risk of labor abnormalities. The patients received mifegin for preparing to labor. A new component in the mechanism of mifegin effect on the uterine cervix in full-term pregnancy was revealed: mifegin elevated the content of cAMP by 50% and almost 2-fold increased the cAMP/cGMP ratio compared to the initial level.