Indexes of arterial blood flow in the utero-placental and fetal-placental circulation

Abstract

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.

Keywords

blood flow in the arteries of the uteroplacental and fetal-placental region / umbilical artery / mother-placenta-fetus / fetal aorta / uterine arteries / pregnancy

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