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Hemolytic differences among artificial cardiac valves used in a ventricular assist pump
G G Billy1, C A Miller, M N Pallone
1Milton S. Hershey Medical Center, Department of Surgery, Pennsylvania State University, Hershey 17033, USA.
Artificial Organs
|April 1, 1995
Summary
Ventricular assist device (VAD) valves can cause significant hemolysis. Different valve designs, like the modified tilting disc valve, show varying levels of blood cell damage, impacting VAD performance.
Area of Science:
- Biomedical Engineering
- Cardiovascular Research
- Materials Science in Medical Devices
Background:
- Ventricular assist devices (VADs) are crucial for cardiac support but can induce hemolysis.
- The mechanical and hemodynamic properties of VAD valves vary significantly.
- Understanding valve-induced hemolysis is critical for improving VAD safety and efficacy.
Purpose of the Study:
- To quantify and compare the hemolytic potential of different VAD valve types.
- To investigate the relationship between VAD valve design and hemolysis.
- To identify specific valve designs that minimize blood damage.
Main Methods:
- Tested four VAD valve types: ball, modified tilting disc (MTD), polyurethane trileaflet, and Björk-Shiley monostrut.
- Utilized a Pierce-Donachy VAD pumping fresh bovine blood in a mock circulatory loop.
- Measured hematocrit and plasma hemoglobin to calculate indices of hemolysis.
Main Results:
- Significant differences in hemolysis were observed among the tested VAD valves.
- The modified tilting disc (MTD) valve exhibited the highest degree of hemolysis.
- No significant hemolytic difference was found between the trileaflet and monostrut valves, despite design variations.
Conclusions:
- VAD valve type is a significant determinant of clinically relevant hemolysis.
- The MTD valve presents a higher risk of hemolysis compared to other tested designs.
- Further research into VAD valve design can optimize hemocompatibility and patient outcomes.