P32.16: Combined evaluation of angle of progression and head direction during pushing as a predictor of vaginal delivery by vacuum extraction

Objectives: Analyze the interference of ultrasound estimation of fetal weight in perinatal outcome in newborns with birth weight greater than 3500 g. Methods: It is a single center retrospective study. 118 newborns with birth weight greater than 3500 g were included. The cases were divided in two groups: 1) infants who have ultrasound estimation of fetal weight within 14 days of delivery and 2) infants who didn’t have it. Fetal weight estimation (FWE) was performed by Hadlock formula. Perinatal outcome was analyzed by cesarean section rate, 5 minutes Apgar score <7, meconium stained newborns, shoulder dystocia occurrence and intensive care unit (ICU) admission. Statistical analysis was done by the chi square test with significant association when P < 0.05. Results: Table 1. Conclusions: Our results suggest that ultrasound FWE increases Cesarean section rate without significant improve in perinatal outcome. More studies are needed to increase the sample size and analyze ultrasound accuracy.