Color doppler assessment of the intervillous circulation in all trimesters of pregnancy

Abstract

Color Doppler sonography can be successfully used for the assessment of the intervillous circulation throughout the three trimesters of pregnancy. The first trimester pregnancies were assessed by the transvaginal route while second and third trimesters pregnancies were evaluated using transabdominal route. Color flow mapping was used for visualization of the outlets of the spiral arteries into the intervillous space and the blood flow inside it. Pulsatile, arterial-like intervillous flow signals and spiral arteries signals were assessed by the use of pulsed Doppler and expressed by resistance (RD and pulsatility (PD indices, peak systolic velocity (PSV), end-diastolic velocity (EDV), and temporal averaged maximum velocity (TAMV). Velocities of blood flow of pulsatile signal in the intervillous space increased significantly towards the mid-pregnancy.

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