Pregnancy Complications Associated with Endometriosis

In: Endometriosis · 2014 · pp. 445–456 · doi:10.1007/978-4-431-54421-0_28 · W373839750
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Endometriosis is associated with infertility and pregnancy complications including preterm birth, SGA, and postpartum hemorrhage, potentially due to defective spiral artery remodeling.

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This paper reviews how endometriosis affects fertility and pregnancy, drawing on studies of natural conception and assisted reproduction, including IVF outcomes and obstetric complications. It reports that in both peritoneal and ovarian endometriosis there are adverse effects on ovulation rates, ovarian reserve markers, and ovarian stimulation response (with some improvement using intracytoplasmic sperm injection), and that when pregnancy occurs it may be complicated by spontaneous hemoperitoneum, placenta previa, and postpartum hemorrhage, while evidence for preeclampsia, small for gestational age, and preterm birth is mixed across cohorts. Limitations explicitly highlighted include inconsistent findings among studies regarding several pregnancy outcomes and an ongoing uncertainty about underlying mechanisms. Relevance to endometriosis: the paper is specifically about endometriosis-associated pregnancy complications, including infertility, risk of preterm birth and placenta-related outcomes, and proposes vascular remodeling abnormalities in endometriosis (and adenomyosis) as part of the pathophysiology.

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Abstract

An association between endometriosis and infertility has been confirmed by a large number of studies, although mechanisms are still debated. The availability of in vitro fertilization represented a major step forward in achieving pregnancy in women with endometriosis, although in both peritoneal and ovarian disease, there is an adverse effect on ovulation rates, markers of ovarian reserve, and response to ovarian stimulation. Results have improved using intracytoplasmic sperm injection. When achieved, pregnancy may be complicated by spontaneous hemoperitoneum, a rare but potentially fatal event. Data on incidence of preeclampsia, small for gestational age (SGA), and preterm birth are not univocal. A large cohort study found an increased risk of preterm birth; another observed no evidence for an association between endometriosis and risk of pregnancy hypertension, or preeclampsia; a third found increased rates of both preterm birth and SGA. In pregnancies complicated by the presence of ovarian endometrioma no differences have been observed in late pregnancy and neonatal outcomes. Endometriosis patients seem to be at an increased risk of placenta previa and postpartum hemorrhage. An association has been found also when pregnancy is achieved through in vitro fertilization, suggesting that events around the time of implantation may be responsible. With regard to pathophysiology, the hypothesis has been proposed that defective spiral artery remodeling may be the cause of major obstetrical syndromes in endometriosis and adenomyosis and that endometrial and myometrial junctional zone (MJZ) abnormalities represent a risk factor for the vascular development of the placental bed. Available evidence supports the idea of a reversibility of MJZ changes by appropriate medication inducing a prolonged hypoestrogenic period. Access this chapter Tax calculation will be finalised at checkout Purchases are for personal use only Similar content being viewed by others

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