[Update on mechanical methods of postcoital contraception. Pt. 2].

Use of postcoital contraception (PC) has been suggested for women when hormonal contraceptives are contraindicated. This is achieved by means of the postcoital insertion of an IUD provided no side effects appear, such as persistent pelvic pain, recurring uterine cramps, prolonged bleeding, metrorrhagia, or expulsion of the device. This type of PC does not inhibit ovulation, but rather produces cellular and biochemical changes in the endometrial mucous membrane and effects tubal hypercontractility and hypermotility, which are responsible for the transport of the ovum into the uterine cavity. Impeding these phenomena results in the destruction of the fertilized egg. Apparently, the strong concentration of copper ions in the uterus from the IUD inhibits fetal development. The contraceptive activity also potentiates the blastocidal effect of bacteria that are inevitably introduced by the IUD. PC also has a great advantage compared to hormonal contraceptives, since it can be used 7-10 days after coitus. Other advantages are the low rate of contraindications, few side effects, and no injury to the embryo. Studies on PC IUD use indicate complete success with this method if CU 7, T-Cu 200, or ML Cu 250 devices are used 1 week or up to 10 days after unprotected sex