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Background Inflammatory bowel disease (IBD) is a chronic inflammatory condition. While it is reported that IBD may result in adverse pregnancy-related outcomes, its effects on placental related diseases are relatively not known. Aims The aim of our work was to determine the risk of adverse pregnancy outcomes in patients with IBD. Methods Medline, Embase, and Cochrane library were searched for studies that reported adverse maternal and obstetrical outcomes in patients with IBD. Weighted odds ratios (OR) with 95% confidence intervals (CI) were calculated for the risk of these outcomes in patients with IBD compared to healthy controls. Results Fifty-three studies were included (7917 patients with IBD and 3253 healthy controls). Cesarean delivery was more common in patients with IBD compared to healthy controls (OR 1.79, 95% CI, 1.16–2.77). This remained significant for UC (OR 1.80, 95% CI, 1.21–2.90) but not CD (OR 1.48, 95% CI, 0.94–2.34). Similarly, gestational diabetes occurred more commonly in IBD (OR 2.96, 95% CI, 1.47–5.98). Furthermore, the incidences of placental diseases were low, 2.0% (95% CI, 0.9–3.1%) for pre-eclampsia, 3.3% (95% CI, 0–7.2%) for placental abruption, 0.5% (95% CI, 0.2–0.9%) for placenta previa, and 0.3% (95% CI, 0–0.5%) for chorioamnionitis. Finally, patients with IBD were more likely to experience preterm premature rupture of membranes (PPROM, OR 12.10, 95% CI, 2.15–67.98), but not an early pregnancy loss (OR 1.63, 95% CI 0.49–5.43). Anti-tumour necrosis factor therapy was not associated with chorioamnionitis (OR 1.12, 95% CI, 0.16–7.67), early pregnancy loss (OR 1.49, 95% CI, 0.83- 2.64), and placenta previa (OR 1.58, 95% CI, 0.30–8.47). Conclusions Patients with IBD are more likely to develop adverse pregnancy-related outcomes such as Gestational Diabetes and PPROM. Pregnancy in patients with IBD should be considered a high-risk period and as such, a multi-disciplinary team, including gastroenterologists, obstetricians and maternal-fetal medicine specialists, is necessary to recognize and effectively manage adverse obstetrical outcomes in order to reduce overall morbidity and mortality. Funding Agencies None

A250 SYSTEMATIC REVIEW WITH META-ANALYSIS: ADVERSE PREGNANCY-RELATED OUTCOMES WITH INFLAMMATORY BOWEL DISEASE