Fan-shaped expanded polytetrafluoroethylene valve in the pulmonary position

Area of Science:

• Cardiovascular Surgery
• Pediatric Cardiology
• Biomaterials Science

Background:

• Residual pulmonary insufficiency is a challenge after transannular repair in pediatric patients.
• Tetralogy of Fallot repair often involves right ventricular outflow tract obstruction.
• Expanded polytetrafluoroethylene (ePTFE) membranes offer potential for valve reconstruction.

Purpose of the Study:

• To evaluate the efficacy of fan-shaped monocuspid and bicuspid valves made of ePTFE for right ventricular outflow tract reconstruction.
• To assess the functional outcomes and durability of these novel valves in pediatric patients with Tetralogy of Fallot.

Main Methods:

• Twenty pediatric patients with Tetralogy of Fallot underwent right ventricular outflow tract reconstruction using a transannular patch and a fan-shaped ePTFE valve.
• The neopulmonary annulus was sized to approximately 130% of normal.
• Follow-up included assessment of right ventricular function and valvular competence.

Main Results:

• Seventeen patients received monocuspid valves and three received bicuspid valves.
• Right ventricular function was well-maintained in all patients.
• Valvular competence was observed in 65% of patients, with trivial to mild pulmonary insufficiency in most cases. No pressure gradient or calcification was noted.

Conclusions:

• Fan-shaped ePTFE valves provide adequate function for transannular right ventricular outflow reconstruction.
• This approach is a useful substitute for managing right ventricular outflow tract obstruction in Tetralogy of Fallot.
• The ePTFE valve demonstrates promising results in maintaining hemodynamic function post-repair.