摘要
In vitro fertilization-embryo transfer （IVF-ET） is an effective method and an elective procedure to treat infertility caused by various factors, for example, endometriosis, tubal obstruction, and polycystic ovary syndrome. However, this technique leads to a higher rate of complications and are therefore always iatrogenic such as ovarian hyperstimulation syndrome, thrombosis, multiple pregnancy, adnexal torsion, pelvic inflammatory disease （PID）, which may threaten fetal or maternal well-being during the whole pregnancy.
In vitro fertilization-embryo transfer （IVF-ET） is an effective method and an elective procedure to treat infertility caused by various factors, for example, endometriosis, tubal obstruction, and polycystic ovary syndrome. However, this technique leads to a higher rate of complications and are therefore always iatrogenic such as ovarian hyperstimulation syndrome, thrombosis, multiple pregnancy, adnexal torsion, pelvic inflammatory disease （PID）, which may threaten fetal or maternal well-being during the whole pregnancy.
