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Assessment of Maternal Vascular Remodeling During Pregnancy in the Mouse Uterus
Published on: December 5, 2015
Systemic arterial response and ventriculo-arterial interaction during normal pregnancy.
Mette-Elise Estensen1, Guro Grindheim, Espen W Remme
1National Resource Centre for Women's Health, Oslo University Hospital, Rikshospitalet, Norway. mette-elise.estensen@ous-hf.no
American Journal of Hypertension
|March 31, 2012
Summary
During normal pregnancy, cardiac output increases while blood pressure and resistance decrease. Ventriculo-arterial coupling increases, indicating reduced left ventricular function not fully compensated by vascular changes.
Area of Science:
- Cardiovascular Physiology
- Reproductive Medicine
- Hemodynamics
Background:
- Normal pregnancy involves increased cardiac output (CO) and reduced blood pressure and systemic vascular resistance.
- Systemic arterial properties and their interaction with left ventricular (LV) function during pregnancy require further description.
Purpose of the Study:
- To evaluate systemic arterial properties during normal pregnancy (NP).
- To assess the interaction between the left ventricle (LV) and systemic arteries during NP.
Main Methods:
- Noninvasive assessment of 65 healthy pregnant women across different gestational weeks and postpartum.
- Measurement of aortic root pressure and flow using calibrated pulse traces and Doppler.
- Estimation of arterial compliance (C), characteristic impedance (Z(0)), arterial elastance (Ea), and peripheral resistance (R).
- Characterization of ventriculo-arterial coupling (VAC) using the ratio of arterial to LV elastance index (EaI/ELVI).
Main Results:
- CO increased by 20% during NP, driven by heart rate and stroke volume.
- Mean arterial pressure decreased by 10% and peripheral resistance (R) by 5% compared to postpartum.
- Central aortic properties showed less alteration, with a trend for lower Z(0) and higher C.
- The VAC index (EaI/ELVI) increased by 29% during NP due to a greater reduction in LV elastance index (ELVI) compared to arterial elastance index (EaI).
Conclusions:
- Normal pregnancy is characterized by increased CO and reduced blood pressure and peripheral resistance, with minimal changes in central aortic properties.
- The elevated VAC index during NP suggests a decrease in LV function that is not fully offset by vascular adaptations.
- Understanding these hemodynamic shifts is crucial for managing cardiovascular health during pregnancy.
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