Objective: The options for mitral valve replacement in children with irreparable mitral valve disease have been limited to fixed-diameter prostheses that do not accommodate for somatic growth. We have modified an externally stented bovine jugular vein graft (Melody valve) for implantation in this cohort. Because it is not a fixed-diameter prosthesis, we hypothesized that the valve can be expanded in the catheterization laboratory as the child grows.
Methods: The medical records of patients who had undergone Melody valve implantation in the mitral or left atrioventricular valve position from 2010 to 2013 were reviewed.
Results: Eleven patients had undergone Melody valve implantation at a median age of 7 months (range, 2-28). The techniques of valve modification and implantation included stent shortening, adding a pericardial sewing cuff, intraoperative balloon expansion, and fixation of the distal stent to the inferior left ventricle wall. The valve was competent, with a low gradient acutely postoperatively in all patients. One patient died, and one required permanent pacemaker implantation. One patient developed valve dysfunction and required explantation. Two patients without a pericardial sewing cuff developed paravalvular leaks. One patient who had not undergone distal stent fixation developed left ventricular outflow tract obstruction. Three patients who had undergone subsequent catheter-based balloon expansion of the valve have continued to demonstrate acceptable valvular function.
Conclusions: The Melody valve has demonstrated acceptable short-term function. Implantation techniques to prevent left ventricular outflow tract obstruction (suture fixation of the distal stent) and paravalvular leaks (the addition of a pericardial cuff) should be considered. The Melody valve can be percutaneously expanded as the child grows.
Copyright © 2014 The American Association for Thoracic Surgery. Published by Elsevier Inc. All rights reserved.