Assessment of Communication AFI and Uterocervical Angle with Pregnancy Duration in Patients with Pretem Premature Rupture of Membranes 24-34 Weeks

Premature rupture of membranes (PROM) and preterm delivery are the most important problems observed in pregnancies that can cause many consequences. The present study investigated the relationship between amniotic fluid index (AFI) and uterocervical angle in patients with PROM between 24 and 34 weeks of gestation.

This study was a cohort study carried out on 50 pregnant women with PROM. Inclusion criteria were 24 to 34 weeks of gestation and singleton deliveries. Demographic characteristics and pregnancy history of the subjects were determined through interviews and examinations. Moreover, AFI and uterocervical angle were determined based on ultrasound results. Subjects were followed up until delivery.

Mean age of the patients was 25.14±5.32 years; 23 patients (46%) had delivery latency less than 7 days. The mean uterocervical angle in the delivery latency group ≤7 was significantly higher than that in the group more than 7 days (P <0.001). Moreover, the mean AFI in the delivery latency group ≤7 was significantly higher (P <0.001). The uterocervical angle above 107.7 with a sensitivity of 87% and a specificity of 88.9% had a predictive power and its area under curve (AUC) was 0.912 (P <0.001). The mean AFI below 5.4 with a sensitivity of 81.5% and a specificity of 65.5% had a predictive power (AUC: 0.866, P <0.001).

Uteroservical angle and AFI can be good predictors for assessing delivery latency in women with PROM. Furthermore, the mean uterocervical angle in the delivery latency group ≤7 days is significantly higher than that in the group more than 7 days, but conversely AFI is less.