Pulmonary valve replacement with mechanical prostheses in re-do Fallot patients

Area of Science:

• Cardiovascular Surgery
• Congenital Heart Disease
• Medical Imaging

Background:

• Tetralogy of Fallot (TOF) often requires reoperations, posing challenges for pulmonary valve replacement (PVR).
• Right ventricular (RV) dysfunction is a common complication following TOF repair.

Purpose of the Study:

• To compare the outcomes of mechanical valve substitutes with and without additional right ventricular (RV) volume reduction plasty (aRVVRP) in TOF patients undergoing re-do PVR.
• To assess the impact of these surgical approaches on RV geometry and function.

Main Methods:

• Prospective clinical study comparing two groups of TOF patients undergoing re-do PVR.
• Group 1: Mechanical valve substitutes with aRVVRP (n=17).
• Group 2: Solitary re-do PVR (n=7).
• Magnetic resonance imaging (MRI) used for pre- and post-operative assessment of ventricular geometry.

Main Results:

• Both groups showed significant improvements in RV ejection fraction and decreases in RV indexed end-diastolic volume and myocardial mass postoperatively.
• Mean follow-up of 31.9 months revealed no mortality.
• Significant improvements in RV geometry were observed in both groups (P<0.001).

Conclusions:

• Mechanical prostheses are suitable alternatives for PVR in TOF, particularly in cases with multiple reoperations and good patient compliance.
• Additional RV volume reduction plasty may be a valuable adjunct in re-do TOF surgery for RV outflow tract dysfunction due to akinetic fibrous areas.