Women with endometriosis at first pregnancy have an increased risk of adverse obstetric outcome

Objective: To evaluate pregnancy, delivery and neonatal outcome in singleton primiparous versus multiparous women with/without endometriosis.

Methods: Multicentric, observational and cohort study on a group of Caucasian pregnant women (n?=?2239) interviewed during their hospitalization for delivery in five Italian Gynecologic and Obstetric Units (Siena, Rome, Padua, Varese and Florence).

Results: Primiparous women with endometriosis (n?=?219) showed significantly higher risk of small for gestational age fetuses (OR: 2.72, 95% CI 1.46–5.06), gestational diabetes (OR: 2.13, 95% CI 1.32–3.44), preterm premature rupture of membranes (OR: 2.93, 95% CI 1.24–6.87) and preterm birth (OR: 2.24, 95% CI 1.46–3.44), and were hospitalized for a longer period of time (p?n?=?1331). Multiparous women with endometriosis (n?=?97) delivered significantly more often small for gestational age fetuses (OR: 2.93, 95% CI 1.28–6.67) than control group (n?=?592). Newborns of primiparous women with endometriosis needed more frequently intensive care (p?=?0.05) and were hospitalized for a longer period of time (p?Conclusions: Women with endometriosis at first pregnancy have an increased risk of impaired obstetric outcome, while a reduced number of complications occur in the successive gestation. Therefore, it is worthy for obstetricians to increase the surveillance in nulliparous women with endometriosis during pregnancy.