2008, Number 4
Rev Esp Med Quir 2008; 13 (4)
Doppler velocimetry of the uterine arteries during pregnancy
Peña DH, Camacho DM, Escobedo AF
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Doppler ultrasound is a noninvasive technique commonly used for fetal and hemodynamics evaluation. The pregnancy causes a large increase in uterine movement, which promotes fetal growth. Vascular changes that occur in the uterine circulation, associated with pregnancy, are consequence of loss of muscle and elastic components of the spiral arteries, due to the invasion and its replacement by trophoblastic tissue fibrinoid. The shape of the wave velocity of the uterine artery is unique, and characterized by a high speed at the end of the diastole. In the course of pregnancy, there is a constant increase of the flow. The failure in the invasion of the spiral arteries by the trophoblast results in increased uterine vascular resistance, with a decrease in perfusion through the placenta; that can arrest the intrauterine growth and cause preeclampsia. The Doppler uterine artery serves as a way of tracking to establish the risk of certain diseases or to predict with some degree of certainty a pregnancy without these complications. In no way the uterine artery Doppler assesses fetal health nor characterizes the behavior of obstetric decisions.
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