Patient-Specific Computer Simulation in TAVR With the Self-Expanding Evolut R Valve

Area of Science:

• Cardiovascular Medicine
• Medical Imaging
• Surgical Technology

Background:

• Transcatheter aortic valve replacement (TAVR) is increasingly used in lower-risk patients, necessitating optimal outcomes.
• Patient-specific computer simulation can predict TAVR outcomes, but its clinical utility and accuracy require prospective validation.

Purpose of the Study:

• To evaluate the added value and predictive accuracy of TAVIguide software in clinical TAVR practice.
• To assess the impact of patient-specific computer simulation on procedural decisions and outcomes.

Main Methods:

• A prospective, observational, multicenter study involving 80 patients with severe aortic stenosis undergoing TAVR with the Evolut R valve.
• Simulation was used in 42 patients to determine valve size and implantation depth, compared to standard methods in 38 patients.
• Primary endpoints included differences in valve size and implantation depth decisions; predictive power was assessed by comparing simulated and observed aortic regurgitation.

Main Results:

• Simulation did not alter valve size selection in 39/42 patients but affected implantation depth in 7/42.
• The TAVIguide simulation influenced the TAVR procedure in 16/42 patients, impacting decisions on additional measures.
• A trend towards higher predicted than observed aortic regurgitation was noted (17.5 vs. 12 ml/s, p=0.13).

Conclusions:

• Patient-specific computer simulation, like TAVIguide, did not significantly change valve size selection for TAVR.
• Simulation impacted the selection of target implantation depth and influenced procedural execution to achieve desired depth.
• The study suggests simulation can refine TAVR planning and execution, potentially improving outcomes.