Tubal infertility and pelvic adhesion increase risk of heterotopic pregnancy after in vitro fertilization: A retrospective study.

To analyze risk factors associated with heterotopic pregnancy and the uterine pregnant outcome of those patients after surgery.We retrospectively analyzed 22 patients diagnosed as HP after in vitro fertilization (IVF) between January 2015 and December 2018.HP was diagnosed at gestation age of 55.4 ± 11.8 days. HP were presented as irregular vaginal bleeding, abdominal pain, and sometimes no symptoms. 81.8% of ectopic lesion in HP occurred at fallopian tubes, especially ampullary; cornual pregnancy takes up 13.6%. Compared with clinical intrauterine pregnancy (IUP), IVF with tubal infertility factors had higher risks of HP (OR 4.185, 95% CI 1.080- 16.217); IVF with pelvic adhesion also had higher risks of HP (OR 5.552 95% CI 1.677-18.382); IVF with more than 2 embryos transferred increased risks of HP (OR 23.253, 95% CI 1.804-299.767). The abortion rates of surgery-treated HP and IUP after IVF were 27.8% versus 10.3% (P = .042).These results demonstrate IVF with tubal infertility, pelvic adhesion or multiembryos transfer are risk factors of HP. Furthermore, surgery could induce abortion.