Comparison of pregnancy outcome between isolated oligohydramnios and oligohydramnios due to intra uterine growth retardation

Introduction: Oligohydramnios can cause several fetal complications while intrauterine growth restriction (IUGR) also is considered as one of the most important causes of oligohydramnios. This study aimed to compare pregnancy outcome in isolated oligohydramnios and oligohydramnios with IUGR. Methods: This cohort study was conducted on 60 18 to 35-year old women whose sonography test results reported an amount less than 5 during the measurement of amniotic fluid index. Cases with normal umbilical arterial Doppler were classified as isolated oligohydramnios group and those with abnormal Doppler sonography were placed into intrauterine growth restriction group. They were followed after delivery and all their pregnancy outcomes were recorded. Results: The average age of studied women and gender of children were not significantly different in each group. Intrauterine death was not observed but 4 cases of neonatal deaths occurred that were not significantly different in each group (P=0.61). No significant difference was observed between mothers with isolated oligohydramnios and cases reporting oligohydramnios together with IUGR in terms of maternal and neonatal outcomes of pregnancy; but chance of admission of neonates with IUGR into NICU was more than twice of cases with isolated oligohydramnios which was not statistically different (P = 0.08, OR = 2.89). Conclusion:The results of this study indicated that worse pregnancy outcome was not much different between cases with isolated oligohydramnios and oligohydramnios with IUGR.