Relationship between ultrasound parameters of the umbilical and middle cerebral arteries and intrauterine fetal distress

Table 1 Comparison of uterine artery, middle cerebral artery, and umbilical artery-related blood flow parameters between the two groups, mean ± SD

Groups	Number	UtA			MCA			UmA
		RI	PI	S/D	RI	PI	S/D	RI	PI	S/D
Observation group	50	0.62 ± 0.14	1.78 ± 0.26	3.04 ± 0.44	0.68 ± 0.07	1.47 ± 0.39	3.18 ± 0.50	0.68 ± 0.12	1.53 ± 0.44	3.54 ± 1.21
Control subjects	50	0.49 ± 0.08	1.42 ± 0.03	2.29 ± 0.41	0.71 ± 0.13	1.82 ± 0.34	4.16 ± 1.34	0.62 ± 0.13	1.31 ± 0.29	2.53 ± 0.52
t		4.934	7.986	6.576	1.758	3.546	3.542	1.855	2.543	4.353
P value		0.001	0.002	0.001	0.064	0.001	0.001	0.068	0.019	0.002

UtA: Uterine artery; MCA: Middle cerebral artery; UmA: Umbilical artery; RI: Resistance index; PI: Pulsatility index; S/D: Systolic maximal flow velocity of the umbilical artery compared to diastolic flow velocity.