Índice de pulsatilidad promedio del doppler de las arterias uterinas como predictor de macrosomía fetal. Años 2011-2012

Abstract

Objective. To determine the usefulness of the mean pulsatility index (PI) of uterine artery doppler before 30 gestation weeks’ as a predictor of macrosomia in newborns treated at the National Perinatal Maternal Institute during the period 2011- 2012. Material and methods. A retrospective, cross-sectional and analytical study. It was determined the mean pulsatility index of the uterine arteries to 232 pregnant women under 30 gestation weeks’ and birth weight was calculated according to birth gestational age for two groups, the first with infants with appropriate birth weight and the second with macrosomic neonates (n = 18/ 7,8%), which were compared using standard deviations, Pearson correlation, Student t test and receiver-operator curve (ROC). Results. Variation was found between the two groups in the four mean indices (peak systolic, peak diastolic, pulsatility index and resistance index), existing correlation with the Pearson test. The mean IP was significantly lower (p = 0,001) in macrosomic infants than in those without macrosomia, showing an inverse relationship between IP values with gestational age. For ROC curve were arbitrarily set two tentative breakpoints for the mean IP of the uterine arteries, the first point ≤ 0,65 was presented in 22,2% of macrosomic infants and 10,3% of the infants without macrosomia, and the second cutoff ≤ 0,75 included 50% of infants with macrosomia and 20,6% of those without macrosomia, Conclusion. A value of mean pulsatility index of the uterine arteries ≤ 0,75 was associated with macrosomia at birth.