Doppler indices in fetoplacental and uteroplacental circulation at 22 weeks of gestation

ABSTRACT

Doppler has revolutionized the field of obstetrics since its introduction in late 1950's. Useful information is obtained during second half of pregnancy and pregnancies with high resistance can be determined. A total number of 100 patients were studied in Combined Military Hospital, Rawalpindi from 01 June 2002 to 25 January 2003. Normal pregnant women with 20 weeks of gestation, from all socioeconomic strata and singleton pregnancy were included in the study. Doppler examination was performed and the range of normal indices determined from all the four vessels. Descriptive statistical analysis of data was carried out. For umbilical artery mean PI was 1.48 [range = 0.92-1.91] RI was 0.78 [range = 0.64-0.84] S/D ratio was 4.68 [range = 3.84-5.6] For uterine artery mean PI was 1.18 [range = 0.69-1.86] RI was 0.54 [range = 0.44-0.66] and S/D ratio was 2.18 [range = 1.92-2.36] for fetal aorta mean PI was 1.94 [range = 1.54-2.42] RI was 0.80 [range = 0.68-0.88] S/D ratio was 6.22 [range = 3.18-6.94]. For MCH PI was 1.86 [range = 1.44-2.30] RI was 0.84 [range = 0.72-0.88] S/D ratio was 5.64 [range = 3.22-7.1]. The determined range of Doppler indices in our study varies as compared to international data. This variation equipment used difference in time of gestation and site of vessel under study