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Obstetrics & Gynecology:
ORIGINAL ARTICLE: PDF Only

Doppler Evaluation of Umbilical Venous and Arterial Blood Flow in the Second and Third Trimesters of Normal Pregnancy.

GERSON, ANDREW G. MD; WALLACE, DAVID M. MD; STILLER, ROBERT J. MD; PAUL, DENNIS RMDS; WEINER, STUART MD; BOLOGNESE, RONALD J. MD

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Abstract

Duplex Doppler ultrasound was used to measure umbilical venous blood flow in 209 normal pregnant women between 20-40 weeks' gestation. The relationship between umbilical venous blood flow and gestational age increased with gestational age, and is described by the equation y = -187.02 + 12.7x. The relationship between flow per kilogram fetal weight and gestational age (y = 198.629 2.24x) yielded values of 153 mL/minute/kg at 20 weeks, 131 mL/minute/kg at 30 weeks, and 108 mL/minute/kg at 40 weeks. Doppler ultrasound was also used to evaluate umbilical arterial waveforms (systolic/diastolic ratio) in 171 normal pregnant women between 20-40 weeks. The relationship between systolic/diastolic ratios and gestational age (y = 6.46 - 0.12x) decreased with advancing gestational age, yielding mean systolic/diastolic ratios (+/- 2 SD) of 4.1 (5.6, 2.6) at 20 weeks, 3.6 (5.1, 2.1) at 24 weeks, 3.1 (4.6, 1.6) at 28 weeks, 2.6 (4.1, 1.1) at 32 weeks, 2.1 (3.6, 0.6) at 36 weeks, and 1.7 (3.1, 0.1) at 40 weeks.

(C) 1987 The American College of Obstetricians and Gynecologists

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