[Pregnancies in spite of intrauterine pessaries in situ].

Reviewing literature the fate of 3027 pregnancies with intrauterine devices in situ, included 43 own cases, is reported. The data strongly suggest to remove the intrauterine devices as early as possible in pregnancy, because otherwise the rate of spontaneous abortion, premature birth and stillbirth is negatively affected. The known elevated risk of extrauterine pregnancies is corroberated. The ratio of 1:4 with the progesterone-T is higher than with other IUDs (1:31 to 1:24,5). The observations do not support the view that intrauterine devices cause malformations. From the results instructions for the management of pregnancies associated with intrauterine devices are set up.