Umbilical and utering doppler velocity waveform indices in normal pregnancy between 24-41 weeks

ABSTRACT

Ultrasound Doppler umbilical and uterine arteries waveforms studies were performed on obstetrically low risk "normal" population between 24-41 weeks of gestation. The established ranges [mean and 95% data interval] of three indices namely; Pulsatility index [PI], Resistance index [RI], and Systolic/Diastolic ratio [SD], compares favorably with data derived from other populations. Both umbilical and utero-placental velocity waveform indices decrease with advanced gestation, but only with umbilical artery indices that this decrease was significant. Fetal weight at birth correlate with uterine but not umbilical artery velocity waveforms indices. These data derived form our own population can be used for further studies of fetal hemodynamics in complicated pregnancies