Echocardiographic Hemodynamics After Aortic Valve Replacement, Wheat, and Bentall Procedure

Area of Science:

• Cardiovascular Surgery
• Cardiac Hemodynamics
• Medical Imaging

Background:

• Echocardiographic hemodynamics after Wheat and Bentall procedures are less studied than isolated aortic valve replacement (AVR).
• These procedures involve replacing the proximal ascending aorta with smaller grafts.
• Understanding hemodynamic differences is crucial for patient outcomes.

Purpose of the Study:

• To compare echocardiographic hemodynamics after isolated aortic valve replacement (AVR), Wheat, and Bentall procedures.
• To investigate the impact of ascending aortic size on hemodynamic measurements.
• To evaluate pressure gradients, pressure recovery, and energy loss across different surgical techniques.

Main Methods:

• Analysis of 213 patients undergoing AVR (n=138), Wheat (n=43), or Bentall (n=32) procedures with 21-23 mm aortic bioprostheses.
• Pre- and post-operative transthoracic echocardiography.
• Ascending aortic area (Aa) assessment via contrast-enhanced computed tomography.

Main Results:

• Bentall group had significantly lower maximal pressure gradient (PG max) and energy loss (EL).
• AVR group showed lower pressure recovery (PR) and higher EL, particularly with smaller ascending aortas (Aa).
• Propensity score-matched analyses confirmed lower PR and higher EL in AVR compared to Wheat and Bentall groups.

Conclusions:

• Caution is needed when interpreting echocardiographic PG max after AVR in patients with small ascending aortas.
• Wheat and Bentall procedures demonstrated higher PR and lower EL compared to AVR.
• These findings suggest improved hemodynamic performance with Wheat and Bentall procedures, especially in specific aortic anatomies.