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J Thorac Cardiovasc Surg 2009;137:914-918
© 2009 The American Association for Thoracic Surgery

Congenital Heart Disease

Valved stents for transapical pulmonary valve replacement

^a Department of Cardiovascular Surgery, Centre Hospitalier Universitaire Vaudois (CHUV), Lausanne, Switzerland
^b Department of Cardio-Thoracic Surgery, Great Ormond Street Hospital for Children (GOSH) NHS Trust, London, United Kingdom

Received for publication March 3, 2008; revisions received August 1, 2008; accepted for publication September 10, 2008.

^_* Address for reprints: Christoph H. Huber, MD, Great Ormond Street Hospital, Cardio Thoracic Surgery, Great Ormond St, London WC1N 3JH, United Kingdom. (Email: huberch{at}gmail.com).

Objectives: Pulmonary valve insufficiency remains a leading cause for reoperations in congenital cardiac surgery. The current percutaneous approach is limited by the size of the access vessel and variable right ventricular outflow tract morphology. This study assesses the feasibility of transapical pulmonary valve replacement based on a new valved stent construction concept.

Methods: A new valved stent design was implanted off-pump under continuous intracardiac echocardiographic and fluoroscopic guidance into the native right ventricular outflow tract in 8 pigs (48.5 ± 6.0 kg) through the right ventricular apex, and device function was studied by using invasive and noninvasive measures.

Results: Procedural success was 100% at the first attempt. Procedural time was 75 ± 15 minutes. All devices were delivered at the target site with good acute valve function. No valved stents dislodged. No animal had significant regurgitation or paravalvular leaking on intracardiac echocardiographic analysis. All animals had a competent tricuspid valve and no signs of right ventricular dysfunction. The planimetric valve orifice was 2.85 ± 0.32 cm². No damage to the pulmonary artery or structural defect of the valved stents was found at necropsy.

Conclusions: This study confirms the feasibility of direct access valve replacement through the transapical procedure for replacement of the pulmonary valve, as well as validity of the new valved stent design concept. The transapical procedure is targeting a broader patient pool, including the very young and the adult patient. The device design might not be restricted to failing conduits only and could allow for implantation in a larger patient population, including those with native right ventricular outflow tract configurations.