Longitudinal changes in maternal hemodynamics in a population at risk for pre-eclampsia

Area of Science:

• Obstetrics and Gynecology
• Cardiovascular Physiology
• Perinatal Medicine

Background:

• Pre-eclampsia (PE) and gestational hypertension (GH) are significant hypertensive disorders of pregnancy.
• Understanding longitudinal hemodynamic changes is crucial for early detection and management.
• Previous studies have not fully elucidated the temporal hemodynamic alterations in women developing these conditions.

Purpose of the Study:

• To investigate longitudinal changes in maternal hemodynamics from the first trimester onward in women who develop PE or GH.
• To compare hemodynamic profiles between women who develop preterm PE, term PE, GH, and those who remain normotensive.

Main Methods:

• Prospective longitudinal study of singleton pregnancies at high risk for PE.
• Measurements of augmentation index (AIx), pulsed wave velocity (PWV), and aortic systolic blood pressure (SBPao) taken every 4 weeks.
• Comparison of hemodynamic values between normotensive, preterm PE, term PE, and GH groups.

Main Results:

• In normotensive pregnancies, AIx showed a U-shaped relationship with gestational age, while PWV and SBPao increased mildly later in gestation.
• Women with GH and preterm PE exhibited higher SBPao compared to normotensive women, with no significant change over gestation.
• Preterm PE was associated with significantly higher PWV and AIx from 16-17 weeks' gestation onward, with increasing differences over time.

Conclusions:

• This study characterizes the temporal hemodynamic changes in pregnant women who develop PE or GH.
• Elevated SBPao is a feature of GH and preterm PE, while preterm PE is also marked by early elevations in PWV and AIx.
• These findings contribute to understanding the pathophysiology and potential early markers for hypertensive disorders of pregnancy.