title: Ectopic pregnancy. Relationship to the preceding contraception.
abstract: The incidence of extrauterine pregnancies in all the deliveries in this clinic has increased from 1.3% in 1968 to 2.5% in 1976. Of 163 consecutive extrauterine pregnancies during a ten month period in 1976, 40% had an intrauterine contraceptive device in situ at the time of conception. 650 healthy women who had had an IUD inserted in 1973 were follow-up for an average of 3 years and all extrauterine and intrauterine pregnanices registered while the device was in situ. 27 intrauterine and 4 extrauterine pregnancies occurred over 1,572 women-years of use. From these data it was calculated that 99.5% of all possible intrauterine implantation and 93.5% of tubal implantations were inhibited by the device. This difference is apparently the reason for the increased risk of extrauterine pregnancies in IUCD users.
mesh_terms: D000029:Abortion, Legal; D000328:Adult; D003276:Contraceptives, Oral / Q000009:adverse effects; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects*; D007435:Intrauterine Devices, Copper / Q000009:adverse effects; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000453:epidemiology / Q000209:etiology*
chemical_list: D003276:Contraceptives, Oral