[Dilatation of the os uteri in various types of amniotic rupture and in induction of labor (author's transl)].

Basing on the "partial dilatation" ("Teileröffnungszeiten" (W. Wolf), ie the time in which the os uteri opens from a certain size to its full potential, the process of openning of the os uteri was compared between various types of rupture of the amnion and in programmed induction of labor. Both in the case of primiparas and pluriparas, opening is fastest after early rupture of the amnion, followed by premature amniotic opening and opening at induction of labor. Opening is slowest in the case of timely rupture of the amnion. However, the differences in the opening process between induction of labor and premature amniotic rupture on the one hand, and between induction of labor and timely amniotic rupture on the other, are not significant. The differences in opening following spontaneous onset of labor are attributed to the individual varying circumstances relating to the mechanism of birth. In regard to the temporal course of birth, neither the mother nor the child is subjected to an increased stress of labor resulting from induction of labor.