Gestational hypertensive disorders show unique patterns of circulatory deterioration with ongoing pregnancy

Area of Science:

• Cardiovascular physiology
• Obstetrics
• Hypertensive disorders of pregnancy

Background:

• Gestational hypertensive disease (GHD) encompasses preeclampsia and gestational hypertension.
• Combined assessments of cardiovascular function and body fluid dynamics in GHD are lacking.
• Distinct pathophysiological pathways may exist for early-onset preeclampsia (EPE), late-onset preeclampsia (LPE), and gestational hypertension (GH).

Purpose of the Study:

• To investigate the progression of circulatory dysfunction and body fluid changes in GHD.
• To differentiate the cardiovascular and fluid pathway characteristics of EPE, LPE, and GH.
• To establish a baseline for understanding GHD pathophysiology throughout pregnancy.

Main Methods:

• Prospective, observational study involving pregnant women.
• Standardized measurements included blood pressure, bioimpedance analysis for body water, impedance cardiography for cardiac/arterial assessment, and Doppler-ECG for venous and arterial flow.
• Data analyzed using linear mixed models to assess trimestral changes within and between uncomplicated pregnancy (UP) and GHD subgroups (EPE, LPE, GH).

Main Results:

• All GHD groups showed increasing abnormal cardiovascular parameters and rising body water content from the first to third trimester compared to UP.
• First-trimester GHD exhibited higher blood pressure and peripheral resistance than UP.
• EPE showed increased uterine flow resistance and extracellular water; LPE demonstrated lower heart rate and aorta flow velocity.

Conclusions:

• A gestational increase in body water volume accompanies progressive cardiovascular dysfunction in GHD.
• Distinct pathophysiological pathways characterize EPE, LPE, and GH.
• This study provides novel insights into the multifaceted nature of GHD.