Objective: This study will evaluate whether fetal cerebroplacental ratio (CPR) can predict perinatal adverse outcomes in singleton pregnancies with mild and moderate idiopathic polyhydramnios (IP).
Method: This study was designed as a prospective case-control study between January 2023 and November 2023. Pregnant women diagnosed with mild-to-moderate IP and low-risk singleton pregnancies were included in the study. In all cases, umbilical artery (UA) and middle cerebral artery (MCA) pulsatility indices (PIs) were measured at 36-40 weeks of gestation, and CPR was calculated. The group with polyhydramnios was divided into two parts according to whether the CPR value was below 1.08 or 1.08 and above. Perinatal outcomes of all groups were compared.
Results: A total of 140 patients were included in the study. Seventy of these were IP cases, and 70 were low-risk pregnant women. UA PI in the IP group was not statistically different from that in the low-risk group, but MCA PI and CPR were significantly lower in the IP group (P = 0.07, P = 0.001, and P = 0.004, respectively). IP cases were divided into a low group (<1.08, n = 18) and a normal group (≥1.08, n = 52) according to the CPR value. Cesarean section rates due to fetal distress were significantly higher in the low-CPR group (n = 8 [44.4%] vs 5 [9.6%], P = 0.001). In the low-CPR group, 5-min Apgar <7, and neonatal intensive care unit (NICU) admission rates were significantly higher (P = 0.045 and P = 0.001, respectively).
Conclusion: It is encouraging that in cases with mild-to-moderate IP, low CPR predicts emergency delivery due to fetal distress, a low Apgar score at 5 min, and NICU admission.
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