Why the study?
Aortic valve replacement is definitive therapy for severe aortic stenosis, but the comparative effect of mechanical versus bioprosthetic valves on survival in patients aged 50–65 years required evaluation.
Does a mechanical prosthesis improve overall survival compared to a bioprosthesis in patients aged 50 to 65 years undergoing isolated aortic valve replacement for severe aortic valve stenosis?
Does a mechanical prosthesis improve overall survival compared to a bioprosthesis in patients aged 50 to 65 years undergoing isolated aortic valve replacement for severe aortic valve stenosis?
In patients aged 50 to 65 years undergoing isolated aortic valve replacement, mechanical and bioprosthetic valves offer similar long-term survival, though bioprostheses with a large indexed effective orifice area may provide a survival advantage.
No survival difference seen between MP and BP; leaves open prosthesis selection for this age group pending prospective trials.
Background: Aortic valve replacement (AVR) is the definitive therapy for patients with severe aortic valve stenosis (AoS). The aim of this work is to compare the effect of a mechanical prosthesis (MP) and a bioprosthesis (BP) on the survival of patients aged 50–65 years after AVR. Methods: The retrospective analysis included 276 patients aged 50 to 65 years who had undergone isolated AVR for AoS; 161 patients were implanted with an MP and 115 with a BP. Patient survival, adjusted for age, gender and risk parameters affecting survival, was assessed. A subgroup analysis was performed on the 208 patients with a modern valve (prosthesis models that are no longer used in clinical practice were removed from the sample). Results: After adjusting for risk factors for overall survival as well as for age and sex, the implantation of an MP did not have a significant effect on overall survival in comparison to a BP, at a median follow-up of 10.3 years (p = 0.477). The size of the MP had no significant effect on overall survival either (HR: 1.29; 95%CI: 0.16–10.21; p = 0.812). However, the indexed effective orifice area of the BP had a positive effect on overall survival (HR: 0.09; 95%CI: 0.01–0.78; p = 0.029). Conclusions: The estimated survival of patients aged between 50 and 65 years after implantation of a BP with a sufficiently large indexed effective orifice area may exceed that of patients with an MP.
No takes yet. Share an insight, caveat, or question.
Toporcer et al. (2025) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: