Postpartum Hemorrhage: Preterm Versus Term Pregnancies [ID: 1356883]

INTRODUCTION: Unlike neonatal morbidity with preterm birth (PTB; <37 weeks), maternal complications with PTB are infrequently reported. We aimed to assess the risk of postpartum hemorrhage (PPH)-related maternal morbidity among preterm versus term deliveries. METHODS: This was a secondary analysis of an IRB-approved retrospective cohort of all in-house singleton deliveries over 1 year. Demographics, pregnancy and delivery characteristics were abstracted from charts. Individuals who delivered preterm were compared to those who delivered at term (>37 weeks) for the primary outcome of composite maternal morbidity (CMM—blood loss >1,000 mL, uterotonic use, transfusion, uterine tamponade, surgical intervention, intensive care unit [ICU] admission, hysterectomy, and maternal death). Multivariable regression was performed to assess the adjusted relative risk (aRR) of preterm delivery on CMM with variables specified a priori. RESULTS: Of the 4,554 deliveries in our level 4 hospital, 4,514 (99%) met the inclusion criteria, with 1,062 (23%) delivering preterm. The overall CMM was 23.2%, with it being 30.4% in PTB and 21.0% in term births. Controlling for age, body mass index greater than 30 kg/m2, nulliparity, insurance status, race, smoking status, and cesarean delivery, preterm deliveries had a 42% higher rate of the CMM compared to term births (aRR 1.42: 95% CI, 1.27, 1.60). Transfusion, ICU admission, and hysterectomy were significantly more common among PTB than term. CONCLUSION: Preterm deliveries were associated with significantly higher rates of postpartum hemorrhagic CMM than those who delivered at term. Interventional trials are needed to decrease the hemorrhagic morbidity with PTB.