Journal of obstetrics and women's diseasesJournal of obstetrics and women's diseases1684-04611683-9366Eco-Vector9036910.17816/JOWD90369Research ArticleIndexes of arterial blood flow in the utero-placental and fetal-placental circulationPolyaninA. A.<p>Doctor of Medical Sciences, Professor, Honored Doctor of the Russian Federation</p>info@eco-vector.comKoganIgor Y.<p>Doctor of Medical Sciences, Professor, Department of Obstetrics and Gynecology</p>info@eco-vector.comState Medical University named after acad. I.P. PavlovaResearch Institute of Obstetrics, Gynecology and Reproductology named after D.O. Ott1404200251210121404200214122021Copyright © 2002, Eсо-Vector2002<p>The aim of this study was to asses the normal ranges for S/D ratio and pulsatility index (PI) for umbilical artery (UA), aorta (A), middle cerebral artery (MCA), renal artery (RA) and uterine artery (UtA) during normal pregnancy. Results showed decrease of S/D ratio and PI for UA, UtA from 8 to 40 weeks of gestation and PI for RA from 20 to 40 weeks of gestation. S/D ratio and PI for A was not changed during second half of normal pregnancy. S/D ratio and PI for MCA were increased from 20 to 30 weeks of gestation and after that had tendency of decreasing to term.</p>blood flow in the arteries of the uteroplacental and fetal-placental regionumbilical arterymother-placenta-fetusfetal aortauterine arteriespregnancyкровоток в артериях маточно-плацентарной и плодовоплацентарной областиартерия пуповинымать-плацента-плодаорта плодаматочные артериибеременность