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Vascular thrombosis during support with continuous flow ventricular assist devices: correlation with computerized
Biswajit Kar1, Reynolds M Delgado, Branislav Radovancevic
1Cardiopulmonary Transplant Service, Texas Heart Institute, Houston, TX 77030, USA. bkar6@aol.com
Congestive Heart Failure (Greenwich, Conn.)
|August 18, 2005
Summary
Continuous flow pumps may increase thrombosis risk in patients with peripheral stenosis. Reduced pulsatility creates blood stagnation zones, potentially accelerating vessel occlusion. Further research is needed for these heart failure devices.
Area of Science:
- Cardiovascular physiology
- Biomedical engineering
- Medical device technology
Background:
- Continuous flow pumps are vital for severe heart failure, but alter arterial flow dynamics by reducing pulsatility.
- This altered hemodynamics may increase thrombosis risk in patients with pre-existing peripheral stenosis.
Purpose of the Study:
- To investigate the hemodynamic effects of continuous flow on stenotic peripheral arteries.
- To analyze the potential for accelerated vascular occlusion due to altered blood flow patterns.
Main Methods:
- Computerized flow modeling simulation was employed.
- A stenotic common carotid artery model was created based on clinical data.
- Hemodynamics, including blood stagnation, low shear stress, and velocity, were analyzed under pulsatile and nonpulsatile flow conditions.
Main Results:
- Nonpulsatile flow from continuous pumps created blood stagnation zones adjacent to the stenosis.
- These stagnation zones exhibited low shear stress and velocity.
- Such stagnation was absent during simulated pulsatile flow.
Conclusions:
- Altered physiologic flow from continuous pumps may promote thrombosis in stenotic vessels.
- This mechanism could accelerate arterial conduit occlusion in patients with peripheral vascular disease.
- Further investigation is warranted to understand the clinical implications for patients with continuous flow devices.