title: The effect of fetal heart rate on umbilical artery flow velocity waveforms.
abstract: Umbilical artery flow velocity waveforms were obtained using continuous wave Doppler ultrasound in 85 normal pregnancies (25 antepartum, 60 intrapartum) to examine the relation between fetal heart rate, end systolic/end diastolic ratio (A/B ratio) and resistance index (RI). Our results demonstrated a significant negative correlation between fetal heart rate, A/B ratio and RI (in the antepartum group r = -0.49, and in the labouring group r = -0.65). It is therefore important when performing mathematical analysis of umbilical artery flow velocity profiles to make a statistical allowance for fetal heart rate.
authors.forename: G
authors.initials: G
authors.lastname: Mires
authors.forename: J
authors.initials: J
authors.lastname: Dempster
authors.forename: N B
authors.initials: NB
authors.lastname: Patel
authors.forename: J W
authors.initials: JW
authors.lastname: Crawford
mesh_terms: D001783:Blood Flow Velocity; D005260:Female; D006340:Heart Rate, Fetal; D006801:Humans; D011247:Pregnancy / Q000502:physiology*; D011263:Pregnancy Trimester, Third; D014463:Ultrasonography; D014469:Umbilical Arteries / Q000502:physiology*