Hemodynamics of preeclampsia

Area of Science:

• Obstetrics and Gynecology
• Cardiovascular Physiology
• Critical Care Medicine

Background:

• Preeclampsia presents complex cardiovascular changes.
• Hemodynamic measurements in preeclampsia show conflicting results.
• Understanding these changes is crucial for maternal and fetal health.

Purpose of the Study:

• To review and synthesize existing literature on cardiovascular hemodynamics in preeclampsia.
• To identify areas of consensus and disagreement in hemodynamic findings.
• To clarify the impact of treatment on preeclampsia hemodynamics.

Main Methods:

• Systematic review of English literature.
• Analysis of studies using noninvasive and invasive hemodynamic monitoring techniques.
• Comparison of data from untreated and treated preeclamptic patients versus normotensive pregnancies.

Main Results:

• Untreated preeclampsia: typically low cardiac output (CO), low pulmonary capillary wedge pressure (PCWP), and high systemic vascular resistance (SVR).
• Treated preeclampsia: often normal to elevated CO, PCWP, and SVR.
• Severe preeclampsia and postpartum period: markedly reduced plasma colloid oncotic pressure, increasing pulmonary edema risk, especially with excessive crystalloid therapy.

Conclusions:

• Significant disagreement exists regarding preeclampsia's cardiovascular hemodynamics.
• Treatment status profoundly influences measured hemodynamic parameters.
• Reduced plasma colloid oncotic pressure poses a significant risk for pulmonary edema, particularly postpartum.
• The definitive cardiovascular hemodynamics of preeclampsia remain undetermined.