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Sustained heart failure induced by repeated microsphere injections for left ventricular assist device testing
A Moritz1, L K Fujimoto, G Wollenek
1Second Department of Surgery, University of Vienna, Austria.
ASAIO Transactions
|July 1, 1989
Summary
Researchers developed a reliable method to induce heart failure in calves using microsphere injections. This model effectively simulates chronic heart failure for testing left ventricular assist device (LVAD) systems.
Area of Science:
- Cardiovascular Science
- Medical Device Engineering
- Animal Models in Research
Background:
- Developing reliable animal models for heart failure is crucial for testing medical devices.
- Left ventricular assist devices (LVADs) are vital for managing advanced heart failure.
- Existing models may not fully replicate the subacute to chronic progression of heart failure.
Purpose of the Study:
- To establish and validate a novel subacute to chronic heart failure model in calves.
- To assess the feasibility of using this model for evaluating left ventricular assist device (LVAD) performance.
- To characterize the hemodynamic changes associated with induced heart failure.
Main Methods:
- Established a heart failure model in five calves via daily left coronary artery injections of polystyrene microspheres (37-70 microns).
- Instrumented animals and monitored key hemodynamic parameters including cardiac output (CO) and left atrial pressure (LAP).
- Implanted atrio-aortic pulsatile LVAD systems in three calves and conducted daily pump-off tests to assess cardiac function.
Main Results:
- Animals without LVAD support showed significant decreases in CO (12 to 5.5 L/min) and stroke volume (SV) (120 to 60 ml), with increased LAP (12 to 25 mmHg) within 10-20 days.
- LVAD experiments were terminated after 5, 10, and 11 days, with observed hemodynamic deterioration during pump-off tests.
- Repeated microsphere injections led to elevated LAP (30-50 mmHg) and reduced CO (4-6 L/min) in unsupported animals, indicating induced sclerotic cardiomyopathy.
Conclusions:
- Daily stepwise microsphere injections provide a safe and reliable method for inducing sclerotic cardiomyopathy in a calf model.
- This model effectively mimics subacute to chronic heart failure, suitable for testing LVAD systems.
- The induced model allows for reliable assessment of cardiac function and device performance under simulated heart failure conditions.
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