Maternal Cardiovascular Dysfunction is Associated with Hypoxic Cerebral and Umbilical Doppler Changes.

Area of Science:

• Obstetrics and Gynecology
• Maternal-Fetal Medicine
• Cardiovascular Physiology

Background:

• Maternal cardiovascular (CV) function plays a critical role in pregnancy outcomes.
• Understanding the interplay between maternal CV health and fetal well-being is crucial for identifying and managing high-risk pregnancies.

Purpose of the Study:

• To investigate the relationship between maternal cardiovascular function and fetal Doppler changes.
• To analyze maternal cardiac output (CO) and peripheral vascular resistance (PVR) in relation to fetal vascular impedance in healthy pregnancies and those with pre-eclampsia (PE), small for gestational age (SGA), or fetal growth restriction (FGR).

Main Methods:

• A three-center prospective study involving 81 healthy controls, 47 women with PE, 65 with SGA/FGR, and 40 with PE + SGA/FGR.
• Maternal CV assessment using inert gas rebreathing, continuous Doppler, or impedance cardiography.
• Analysis of maternal CO and PVR in relation to uterine artery, umbilical artery (UA), and middle cerebral artery (MCA) pulsatility indices (PI) and absent/reversed end-diastolic (ARED) flow in the UA.

Main Results:

• Maternal CO was inversely related to fetal UA PI and positively related to MCA PI.
• Maternal PVR showed the opposite relationship, positively associated with increased uterine artery impedance.
• Lower maternal CO and higher PVR were observed in the presence of UA ARED flow.

Conclusions:

• Maternal CV dysfunction is associated with fetal vascular changes, specifically increased impedance in the fetal-placental circulation and decreased impedance in fetal cerebral vessels.
• These associations are most pronounced with critical UA Doppler changes.
• The findings suggest a potential mechanism for therapeutic intervention in pregnancies with CV dysfunction and associated fetal vascular alterations.