Mitral Patient-Prosthesis Mismatch Predicts Suboptimal Hemodynamic Recovery after Mitral Valve Replacement.

Area of Science:

• Cardiovascular Surgery
• Biomedical Engineering
• Cardiac Physiology

Background:

• Investigating the link between obstructive prostheses and suboptimal hemodynamic recovery post-mitral valve replacement (MVR).
• Examining the regression of systolic pulmonary artery pressure (sPAP) and functional tricuspid regurgitation (FTR) as indicators of recovery.
• Defining patient-prosthesis mismatch using effective orifice area index (EOAI).

Purpose of the Study:

• To identify a specific EOAI value that predicts suboptimal hemodynamic recovery after MVR.
• To establish a threshold for defining patient-prosthesis mismatch in the context of mechanical mitral valve implantation.
• To guide the selection of prosthesis size for optimal postoperative outcomes.

Main Methods:

• A cohort of 128 patients undergoing isolated mechanical MVR was analyzed.
• Patients were grouped based on the regression of sPAP and FTR (satisfactory ≥30% vs. suboptimal <30%).
• Receiver operating characteristic (ROC) curve analysis was used to determine the predictive EOAI cutoff value.

Main Results:

• A significant difference in mean in-vivo EOAI was observed between groups (1.23 cm2/m2 vs. 1.11 cm2/m2).
• An EOAI of 1.19 cm2/m2 was identified as the cutoff value predicting suboptimal postoperative regression.
• Suboptimal regression in pulmonary hypertension and FTR was predicted by EOAI <1.19 cm2/m2.

Conclusions:

• An in-vivo EOAI <1.19 cm2/m2 strongly indicates suboptimal hemodynamic recovery after MVR with bileaflet mechanical prostheses.
• While prosthesis size and EOAI were not directly correlated, implanting the largest possible prosthesis is recommended.
• This finding aids in optimizing patient-prosthesis selection to improve hemodynamic outcomes.