Reproductive and neonatal outcomes in women with unicornuate uterus: a population-based study

Abstract

Objective: To investigate reproductive and neonatal outcomes in women with unicornuate uterus. Study design: Data from the Health Care Cost and Utilization Project-Nationwide Inpatient Sample database were extracted from 2010 through 2014 to create a delivery cohort using ICD-9 codes. Code 752.33 was used to identify cases with unicornuate uterus and reproductive outcomes were compared to pregnancies without unicornuate uterus. A multivariate logistic regression model was used to adjust for statistically significant variables (P-value<0.05). Results: Among 3,850,226 deliveries during the study period, 802 women had unicornuate uterus. Patient with unicornuate uterus were more likely to be older (P<0.001), have thyroid disease (P<0.001), previous Caesarean section (P<0.001), and to have had in-vitro fertilization (IVF) (P<0.001). The risk of gestational diabetes, pregnancy induced hypertension, gestational hypertension and preeclampsia were significantly greater in the unicornuate uterus group relative to controls, after controlling for baseline risk factors; aOR 1.32 [95% CI 1.03–1.71], aOR 1.46 [95% CI 1.16–1.85], aOR 1.16 [95% CI 1.22-2.28] and aOR 1.70 [95% CI 1.24-2.32], respectively. Also, the rates of preterm delivery, preterm premature rupture of membranes and caesarean section were higher in the unicornuate uterus group compared to controls after controlling for confounding factors, aOR 3.83 (95% CI 3.19–4.6), aOR 5.11 (95% CI 3.73–7.14) and aOR 11.38 (95% CI 9.16–14.14) respectively. At birth, 11.1% and 2.6% of neonates were small for gestational age in the unicornuate uterus and the control groups, respectively, aOR 4.90, (95% CI 3.87-6.21). Conclusion: Women with unicornuate uterus are at higher risk for pregnancy complications, preterm delivery and having small for gestation age neonates. Women with known unicornuate uterus may benefit from increased surveillance to prevent and/or decrease maternal and neonate morbidity and mortality.