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

Table 3

The S/D, RI, and PI of UmA and MCA blood flows in normal and hypoxic fetuses at 37-41 gestational weeks.

Group	N	UA			MCA
		S/D	RI	PI	S/D	RI	PI
Normal	80
Hypoxic	46
		16.46	30.26	6.64	4.22	13.54	2.192
		<0.001	<0.001	<0.001	<0.001	<0.001	0.03

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