Key result
Tissue mitral valves linked to ~26% lower 10-year freedom from reoperation versus mechanical valves, with similar survival.
Why the study?
The debate regarding the optimal mitral valve prosthesis continues, prompting a comparison of early and late outcomes after isolated mitral valve replacement with tissue versus mechanical valves.
Does tissue mitral valve replacement compared to mechanical valve replacement improve survival and reduce reoperation in patients undergoing isolated MVR?
Cohort (n=291)
Does tissue mitral valve replacement compared to mechanical valve replacement improve survival and reduce reoperation in patients undergoing isolated MVR?
Absolute Event Rate: 67% vs 93%
p-value: p=<.001
Tissue mitral valves are associated with a significantly higher risk of reoperation at 10 years compared to mechanical valves, with no difference in survival, suggesting mechanical valves remain a valid option, especially for younger patients.
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Tissue valves may raise reoperation risk without survival gain in observational data; leaves open optimal prosthesis selection pending randomized trials.
Arafat et al. (2022) conducted a cohort in isolated mitral valve replacement (n=291). tissue valves vs. mechanical valves was evaluated on freedom from reoperation at 10 years (p=<.001). Tissue mitral valves were associated with significantly lower freedom from reoperation at 10 years compared to mechanical valves (67% vs 93%, p<.001), with no significant difference in survival.
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