Ultrasound Parameters of Umbilical Artery Blood Flow Are Associated with Amniotic Fluid and Umbilical Artery Concentrations of Erythropoietin and Oxidative Stress Injury

Table 2

The S/D, RI, and PI of UmA and MCA blood flows in normal and hypoxic fetuses at 32-36 gestational weeks.

Group	N	UmA			MCA
		S/D	RI	PI	S/D	RI	PI
Normal	80
Hypoxic	46
		13.31	11.46	13.38	8.29	12.04	10.32
		<0.001	<0.001	<0.001	<0.001	<0.001	<0.001

Note: UmA: umbilical artery; MCA: middle cerebral artery; S/D: systolic to diastolic ratio; RI: resistant index; PI: pulse index.