Variables of the study
Patients with uterine rupture were divided in two groups according to maternal and/or fetal complications or not, and compared. Maternal complication was defined by estimated postpartum hemorrhage (blood loss volume more than 500ml after vaginal birth or more than 1000ml after caesarean section), hysterectomy, obstetric injury (genital and/or urinary injury) and maternal death. Neonatal complication was defined as Apgar score < 7 at 5 min, neonatal intensive-care unit (NICU) admission, and neonatal death10, 11. A complete uterine rupture was defined as tearing in all layers of the uterine wall, including the serosa and amniotic membranes. An incomplete uterine rupture was defined as tearing in the muscular layers, with intact serosa or amniotic membranes12.
We retrieved the charts of uterine rupture cases and collected independent variables : 1) socio-demographic characteristics (age, parity, education and place of residence; 2) pregnancy and labor related variables (previous cesarean section, ectopic pregnancy, uterine myomectomy and other uterine operation history, intrauterine operation; 3) clinical symptoms and signs 4) maternal and fetal outcomes (delivery method, blood loss and transfusion, postpartum hemorrhage, ICU, birth weight, 5-minute Apgar score<7).