Aortic Root Biomechanics After Sleeve and David Sparing Techniques: A Finite Element Analysis

Area of Science:

• Cardiovascular Surgery
• Biomedical Engineering
• Computational Mechanics

Background:

• Aortic root aneurysms (AR) pose a significant clinical challenge.
• Valve-sparing procedures like David and Yacoub offer solutions but are complex.
• The Sleeve technique presents a simpler alternative with encouraging preliminary results.

Purpose of the Study:

• To biomechanically quantify the effects of the Sleeve procedure on the aortic root.
• To assess if the Sleeve technique induces abnormal stresses that could compromise durability.
• To compare the biomechanical outcomes of the Sleeve and David techniques.

Main Methods:

• Development of two finite element (FE) models: physiologic and aneurysmal aortic root (AR).
• Simulation of Sleeve and David techniques on the aneurysmal AR model.
• Computation of aortic root biomechanics across two cardiac cycles for each simulated technique.

Main Results:

• Both Sleeve and David techniques normalized aortic valve (AV) leaflet kinematics.
• The Sleeve technique resulted in significantly lower leaflet stresses compared to the David technique (35% lower on average).
• Commissural stresses were reduced in the Sleeve model (208 kPa) compared to the aneurysmal state (318 kPa) and the David model (369 kPa).

Conclusions:

• The Sleeve technique demonstrates no intrinsic structural issues that would compromise its durability.
• The biomechanical findings support the Sleeve technique as a potentially simpler and effective method for AR aneurysm repair.
• Further clinical data is needed to corroborate these findings and assess long-term outcomes.