Rethinking mechanical heart valves in the aortic position: new paradigms in design and testing.

Area of Science:

• Biomedical Engineering
• Cardiovascular Research
• Materials Science

Background:

• Bileaflet mechanical heart valves (MHV) are crucial for aortic valve replacement, especially in specific demographics.
• Despite durability, MHV patients face a higher risk of thromboembolic complications.
• Current MHV technology necessitates lifelong anticoagulant therapy.

Purpose of the Study:

• To review emerging paradigms in MHV design, materials, and surface modifications.
• To address challenges in developing next-generation MHVs with improved thromboresistance.
• To explore advancements for MHVs that reduce or eliminate the need for anticoagulation.

Main Methods:

• Review of current literature on MHV design, materials, and surface modifications.
• Analysis of challenges in MHV innovation, including performance, biocompatibility, and thrombosis mechanisms.
• Discussion of experimental and numerical approaches for evaluating MHV hemodynamics and thrombogenicity.

Main Results:

• Emerging design strategies, materials, and surface modifications show promise for enhancing MHV thromboresistance.
• Limited understanding of MHV thrombosis mechanisms and inadequate testing methodologies hinder innovation.
• Advanced experimental and computational fluid dynamics offer pathways to better assess MHV performance and clotting risks.

Conclusions:

• Next-generation MHVs must prioritize thromboresistance to minimize anticoagulant dependence.
• Overcoming design, biocompatibility, and testing challenges is critical for MHV advancement.
• Further research into flow-induced thrombosis and improved evaluation methods will drive the development of safer, more effective MHVs.