Background: Oligohydramnios is one of the major causes of maternal and perinatal morbidity and mortality. Aim of current study was to evaluating feto-maternal outcome after 37 weeks of pregnancies with oligohydramnios.
Methods: A case control study was conducted from 2011 to 2014. 255 pregnant women (85cases in oligohydramnios and 170 cases in control group) were included, from 37 to 41 weeks. The inclusion criteria for the study purpose was: Thirty seven completed weeks of gestation, amniotic fluid index of ≤5 cm, intact membranes, singleton pregnancy with cephalic presentation. Following patients were excluded from the study: gestational age less than 37 completed weeks associated fetal malformations, ruptured membranes, malpresentation and multiple gestation Fetal growth restriction, Chromosomal abnormalities, diabetes, maternal hypertensive disease and instrumental delivery. To determine the association between oligohydramnios and fetomaternal outcomes, chi-square and Fisher's exact test were used if necessary. Kolmogorov- Smirnov (KS) test was used to test normality of variables distribution in samples.
Results: There was not statistically significant difference regarding maternal age, gestational age, gravidity and parity between case and control group .Results of the present study revealed that the rate of cesarean was significantly higher in oligohydramnios group compared to the control group (75.3% vs. 36.5% respectively). There was statistically significant increasing in meconium passage in control group compared to oligohydramnios group (17.1% vs. 5.9% respectively). Mean of first minute and five minute APGAR score, mean of birth weight, fetal sex and need to admission to NICU were not statistically different between two group of study.
Conclusion: It can be concluded that an amniotic fluid index of ≤ 5 cm detected after 37 completed weeks of gestation is not an indicator of poor perinatal outcome, but it is associated with increasing rate of cesarean delivery.
Keywords: Amniotic Fluid Index, Oligohydramnios, Fetomaternal outcome, Maternal outcome, AFI ≤5 cm