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Maternal hemodynamics in normal and preeclamptic pregnancies: a longitudinal study
T R Easterling1, T J Benedetti, B C Schmucker
1Department of Obstetrics and Gynecology, University of Washington, Seattle.
Obstetrics and Gynecology
|December 1, 1990
Summary
Preeclampsia, a pregnancy complication, is characterized by high cardiac output, not hypoperfusion. This finding challenges current understanding of preeclampsia and its hypertension.
Area of Science:
- Obstetrics and Gynecology
- Cardiovascular Physiology in Pregnancy
- Maternal-Fetal Medicine
Background:
- Preeclampsia is a significant cause of maternal and fetal morbidity and mortality.
- Current understanding often views preeclampsia as a state of hypoperfusion with increased vascular resistance.
- This perspective has guided most research and clinical models of the disease.
Purpose of the Study:
- To test the hypothesis that preeclampsia is characterized by high cardiac output, contrary to the hypoperfusion model.
- To investigate the hemodynamic profile of preeclampsia longitudinally throughout pregnancy.
Main Methods:
- A blinded, longitudinal study design was employed.
- Cardiac output was measured serially using Doppler technique in nulliparous women with uncomplicated pregnancies.
- Measurements were taken throughout pregnancy and six weeks postpartum.
Main Results:
- Cardiac output was significantly elevated throughout pregnancy in women who subsequently developed preeclampsia (P = .006).
- Six weeks postpartum, preeclamptic subjects showed resolved hypertension but persistently elevated cardiac output (P = .001).
- Peripheral resistance remained lower in formerly preeclamptic subjects compared to normotensive controls postpartum (P = .001).
Conclusions:
- Preeclampsia is not a disease of systemic hypoperfusion.
- The findings challenge established models of preeclampsia that are based on the hypoperfusion assumption.
- Elevated cardiac output is a key characteristic of preeclampsia, even after hypertension resolves.