Chronic heart failure model induced by coronary embolization in sheep

Area of Science:

• Cardiovascular Research
• Animal Models
• Heart Failure Pathophysiology

Background:

• Chronic heart failure (CHF) presents a significant global health burden.
• Developing reliable large animal models is crucial for understanding CHF.
• Existing models may lack the stability or specific characteristics needed for certain research.

Purpose of the Study:

• To establish a reproducible large animal model of chronic heart failure.
• To characterize the hemodynamic and structural changes in this model over time.
• To assess the model's suitability for preclinical research, particularly for ventricular assist devices.

Main Methods:

• Chronic heart failure was induced in sheep via intracoronary injection of polymer macrobeads.
• Injections were targeted to the left main, left anterior descending, or left circumflex coronary arteries.
• Echocardiography was used for 20 weeks to measure fractional area change (FAC), end-diastolic ventricular area (EDVA), and regional wall-thickening fraction (WT%).

Main Results:

• End-diastolic ventricular area (EDVA) significantly increased post-embolization and remained elevated for 20 weeks.
• Fractional area change (FAC) significantly decreased, indicating impaired systolic function, and remained depressed.
• Regional wall-thickening fraction (WT%) in the embolized area significantly decreased, confirming localized damage.

Conclusions:

• A simple and stable large animal model for chronic heart failure has been successfully developed.
• The model exhibits persistent changes in cardiac structure and function.
• This model is well-suited for experimental research on chronic heart failure and interventions like ventricular assist devices.