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A longitudinal study of maternal hemodynamics during normal pregnancy
A C van Oppen1, I van der Tweel, G P Alsbach
1Department of Obstetrics and Gynecology, University of Utrecht, The Netherlands.
Obstetrics and Gynecology
|July 1, 1996
Summary
Maternal cardiac output and stroke volume typically decrease in late pregnancy, with variations observed between nulliparous and multiparous women. These hemodynamic changes are crucial for understanding normal pregnancy progression.
Area of Science:
- Cardiovascular Physiology
- Maternal-Fetal Medicine
- Obstetrics
Background:
- Understanding maternal hemodynamic adaptations is vital for monitoring pregnancy health.
- Previous studies have indicated significant cardiovascular shifts during gestation.
Purpose of the Study:
- To investigate maternal hemodynamic changes throughout normal pregnancy.
- To analyze the time course of hemodynamic indices during gestation and postpartum.
Main Methods:
- Serial hemodynamic investigations using thoracic electrical bioimpedance in 50 healthy pregnant women.
- Analysis of variance with repeated measurements to track hemodynamic indices over time.
Main Results:
- Mean heart rate increased gradually, while mean arterial pressure showed a biphasic change (decrease then increase).
- Mean cardiac output and stroke volume decreased in the third trimester, with increased systemic vascular resistance.
- Cardiac output variations were noted in the third trimester; nulliparous women had higher cardiac output than multiparous women.
Conclusions:
- Maternal cardiac output and stroke volume decrease in late pregnancy.
- A significant difference in mean cardiac output exists between nulliparous and multiparous women.
- Cardiac output decline in the third trimester is common but not universal.