Prosthesis selection for aortic valve replacement in patients on hemodialysis

Area of Science:

• Cardiovascular Surgery
• Nephrology
• Biomaterials Science

Background:

• Aortic valve stenosis is a common valvular heart disease.
• Hemodialysis patients present unique challenges for valve replacement surgery.
• Prosthesis selection impacts outcomes in this high-risk population.

Purpose of the Study:

• To compare early and long-term outcomes of mechanical valves versus bioprostheses in hemodialysis patients undergoing aortic valve replacement.
• To evaluate the impact of prosthesis type on mortality and major adverse cardiovascular cerebrovascular events (MACCE).

Main Methods:

• Retrospective study of 76 hemodialysis patients from July 2008 to December 2016.
• Patients received either a mechanical valve (n=30) or a bioprosthesis (n=46).
• Comparison of in-hospital, early, and long-term outcomes, including mortality, MACCE, and bleeding complications. Propensity score matching was used for further analysis.

Main Results:

• Mechanical valve recipients were younger. No significant difference in in-hospital mortality.
• Higher bleeding complications observed with mechanical valves (p=0.032).
• No significant differences in long-term mortality (p=0.65) or MACCE (p=0.59) between groups. Propensity score matching confirmed no significant difference in long-term mortality and MACCE.

Conclusions:

• Mechanical valves in hemodialysis patients with aortic valve stenosis are associated with increased bleeding complications.
• Despite bleeding risks, mechanical and bioprosthetic valves demonstrate comparable long-term survival and MACCE rates.
• Prosthesis selection requires careful consideration of bleeding risk versus structural valve deterioration in this cohort.