Key result
Starr-Edwards and St. Jude mechanical valves generate less turbulent stress than Bjork-Shiley valves in vitro.
Why the study?
Mechanical heart valves generate complex flow patterns with elevated turbulent stresses that may contribute to thromboembolism and hemolysis, but comparative flow analyses among common valve designs are limited.
How do flow characteristics and turbulent stresses compare among Starr-Edwards, Bjork-Shiley c-c, and St. Jude Medical mechanical heart valves in the mitral position?
Population
Three mechanical heart valves tested in mitral position under pulsatile flow conditions in vitro
Comparison
Starr-Edwards vs Bjork-Shiley c-c vs St. Jude Medical valves
Design
Experimental study using cardiac simulator and laser Doppler anemometry
Authors
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May lessen hemolysis and thromboembolism risk with select valves; leaves open clinical relevance and need for patient studies.
How do flow characteristics and turbulent stresses compare among Starr-Edwards, Bjork-Shiley c-c, and St. Jude Medical mechanical heart valves in the mitral position?
In an in vitro cardiac simulator, Starr-Edwards and St. Jude Medical mechanical valves demonstrated lower turbulent stresses compared to the Bjork-Shiley c-c valve, which may have implications for thromboembolism and hemolysis risk.
AKUTSU et al. (1996) studied this question. Starr-Edwards, Bjork-Shiley c-c, and St. Jude Medical mechanical heart valves was evaluated on Velocity and turbulent stresses. In an in vitro cardiac simulator, Starr-Edwards and St. Jude Medical mechanical heart valves demonstrated lower turbulent stresses compared to the Bjork-Shiley c-c valve.
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