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A canine model of chronic heart failure produced by multiple sequential coronary microembolizations
H N Sabbah1, P D Stein, T Kono
1Henry Ford Heart and Vascular Institute, Division of Cardiovascular Medicine, Henry Ford Hospital, Detroit, Michigan 48202.
The American Journal of Physiology
|April 1, 1991
Summary
This study developed a reproducible canine model of chronic heart failure using microsphere embolizations. The model effectively mimics key heart failure symptoms, providing a valuable tool for research.
Area of Science:
- Cardiovascular Research
- Animal Models
- Heart Failure Pathophysiology
Background:
- Chronic heart failure (CHF) is a significant clinical challenge.
- Developing reliable animal models is crucial for understanding CHF.
- Existing models may not fully replicate the complex pathophysiology of human CHF.
Purpose of the Study:
- To establish a stable and reproducible canine model of chronic heart failure.
- To investigate the physiological and biochemical changes associated with induced heart failure.
- To validate the model's ability to mimic human CHF sequelae.
Main Methods:
- Induction of chronic heart failure in 20 dogs via multiple sequential intracoronary microsphere embolizations.
- Embolizations were performed 1-3 weeks apart until left ventricular (LV) ejection fraction fell below 35%.
- Comprehensive hemodynamic, volumetric, and neurohormonal assessments were conducted pre- and post-embolization.
Main Results:
- Significant reduction in LV ejection fraction from 64% to 21% over 3 months.
- Elevated LV end-diastolic pressure and volume, decreased cardiac output.
- Increased pulmonary artery wedge pressure, systemic vascular resistance, plasma norepinephrine, and atrial natriuretic factor.
- Postmortem findings revealed myocardial fibrosis and LV hypertrophy.
Conclusions:
- Multiple, spaced intracoronary microsphere embolizations effectively create a chronic heart failure model in dogs.
- This canine model is stable, reproducible, and exhibits key features of human heart failure.
- The model serves as a valuable platform for studying heart failure mechanisms and therapeutic interventions.