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Hypertrophic and functional response to experimental chronic aortic regurgitation
N M Magid1, M S Young, D C Wallerson
1Division of Cardiology, Cornell University Medical College, New York Hospital--Cornell Medical Center, New York 10021.
Journal of Molecular and Cellular Cardiology
|March 1, 1988
Summary
This study created chronic aortic regurgitation in rabbits, showing progressive left ventricular enlargement and hypertrophy. This animal model effectively mimics human responses to aortic valve disease.
Area of Science:
- Cardiovascular Physiology
- Animal Models of Disease
- Cardiac Remodeling
Background:
- Aortic regurgitation (AR) is a significant cardiovascular condition.
- Developing reliable animal models is crucial for studying AR's effects.
- Understanding the hypertrophic response to AR is key for treatment.
Purpose of the Study:
- To establish a chronic animal model of aortic regurgitation.
- To investigate the cardiac remodeling response to induced AR in rabbits.
- To assess the suitability of this model for studying human AR.
Main Methods:
- Aortic regurgitation was induced in 12 rabbits via aortic valve cusp perforation.
- Hemodynamic guidance and electromagnetic flow probes were used for induction and measurement.
- Serial echocardiography (2D, M-mode, Doppler) was performed over 3-6 months.
Main Results:
- Induced AR led to progressive left ventricular dilatation and eccentric hypertrophy.
- Left ventricular end-diastolic dimension increased by 41% (P<0.001).
- Left ventricular mass increased by 94% (P<0.001) with stable fractional shortening and increased end-systolic stress.
Conclusions:
- Acutely induced aortic regurgitation in rabbits creates a valid chronic model.
- This model appropriately simulates the hypertrophic response seen in human aortic regurgitation.
- The rabbit model is suitable for further research into AR pathophysiology and treatment.