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    Breaking News

    Medtronic Releases Results from Two Late-Breaking TPV Trials

    10-year data from Melody TPV trial; first-ever results from investigational Harmony TPV trial.

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    GlobeNewswire05.18.20
    Medtronic plc announced results from two late-breaking clinical trials presented virtually at the 2020 Society for Cardiovascular Angiography and Interventions (SCAI) Scientific Sessions. Ten-year outcomes from the Melody Transcatheter Pulmonary Valve (TPV) Therapy demonstrated strong long-term hemodynamic and safety outcomes, while the first-ever results from the investigational Harmony TPV pivotal trial met safety and efficacy endpoints for hemodynamic function at six months.
     
    Congenital heart disease (CHD) is the most common type of birth defect in the United States, affecting an estimated 40,000 infants each year1. Approximately 22 percent of CHD patients have structural malformations that disrupt the connection between the heart and the lungs2, called the right ventricular outflow tract (RVOT). Typically, a subset of these patients will require open-heart surgery early in life to correct these malformations and some will receive a prosthetic conduit that increases blood flow from the heart to the lungs. Once the conduit is no longer functional, in regions where commercially approved, Melody TPV can be implanted to restore pulmonary valve function and delay additional surgical intervention. As part of the Medtronic congenital heart disease program, the safety and effectiveness of the Harmony TPV is currently being evaluated for patients with RVOT malformations who require a correction to their structural malformation early in life and need a minimally invasive option to restore pulmonary valve function, and are without a conduit.
     
    Melody TPV 10-Year Data Highlights:
     
    • The study demonstrated sustained long-term function of Melody TPV when compared to the historical control of surgical conduit
    • The Melody TPV demonstrated consistent hemodynamics through 10 years as measured by stable RVOT gradients
    • Strong valve efficacy with 97 percent none/trace/mild pulmonary regurgitation at 10 years
    • Annualized incidence of TPV-related endocarditis was 2 percent per patient-year, over the course of long-term follow-up
    • Freedom from major stent fracture 84 percent at 10 years, steady after five years
    • Freedom from any reintervention (surgical or catheter) was 61 percent at 10 years
     
    “Having long-term data is an important milestone especially for this pediatric patient population who are growing and changing so rapidly during a ten-year period,” said Thomas K. Jones, M.D., director of cardiac catheterization at Seattle Children’s in Seattle, Wash. “While the study reinforces the longevity, durability, and efficacy of the Melody TPV, it will also serve as a study model for future evaluations of novel pediatric congenital heart disease technologies.”
     
    The Melody TPV 10-year outcomes trial studied 150 implanted patients ranging from age 7-53, with a median age of 19, and the primary indication for intervention was pulmonary regurgitation (PR). The study assessed Melody long-term functionality, or TPV dysfunction, which is defined as reoperation, catheter reintervention, or hemodynamic dysfunction (i.e. moderate or greater PR and/or mean RVOT gradient >40 mm Hg). The study’s safety outcomes included serious device-related adverse events, stent fracture, catheter reintervention, surgical conduit replacement, and mortality rate.
     
    The first transcatheter valve implanted in a human anywhere in the world and the first to be approved by the Food and Drug Administration (FDA), Melody is the longest studied TPV with the largest body of evidence. This landmark 10-year study provides insight into the long-term durability, safety, and effectiveness of the Melody TPV.
     
    First-Ever Data from the Harmony TPV Pivotal Trial
     
    • The study met its primary safety and effectiveness endpoints of freedom from procedure or device-related mortality and met its hemodynamic function target at six months
    • 100 percent of patients experienced freedom from procedure-or device related mortality at 30 days
    • Acceptable hemodynamic function at six months was achieved in 89 percent of the pivotal trial participants. For the pre-specified primary endpoint analysis, 91 percent of patients from both the EFS and pivotal trial achieved acceptable hemodynamic function, surpassing the performance target of 75 percent
    • 84 percent of patients were free from device failure at six months
    • At six months, 94 percent of patients had no, or mild pulmonary regurgitation and 97 percent had no or mild paravalvular leak
     
    Building onto the initial Early Feasibility Study (EFS), the pivotal study was designed to evaluate the safety and effectiveness of a minimally invasive alternative to open-heart surgery. Harmony TPV was designed to treat patients with RVOT anomalies who develop severe PR typically when a pervious repair fails.
     
    "These pivotal data support the rationale for a potential new therapy designed specifically for the right ventricular outflow tract,” said John P. Cheatham, M.D., lead principal investigator and professor emeritus, Department of Pediatrics, Cardiology at Nationwide Children's Hospital in Columbus, Ohio. “If future study data continues to be strong, we’re hopeful that Harmony may potentially impact this critical, hard-to-treat segment of patients, who have limited treatment choices with current transcatheter technologies.”
     
    This trial is a prospective, non-randomized study evaluating procedural success, safety, and performance of the Harmony TPV device. The study was active across 12 sites in the U.S., Canada and Japan among 50 patients with a mean age of 29 +/- 11. The rigorous patient selection process included those with severe PR after RVOT malformation repair, and an indication for surgical placement of a RV-pulmonary artery conduit or bioprosthetic pulmonary valve. Due to the highly variable anatomy of the patient population, the study required careful screening to assess device fit.
     
    “As demonstrated by these late-breaking studies, we’re consistently building our body of new, short-, and long-term research around innovative, minimally-invasive TPV solutions for CHD patients,” said Sandra Lesenfants, vice president and general manager of the Structural Heart division, which is part of the Cardiac and Vascular Group at Medtronic. “These Harmony data demonstrate our commitment to generating new therapies and growing our congenital heart disease program to support a lifetime of care that this patient population needs.”
     
    Worldwide, the Harmony TPV is limited to investigational use and not approved for sale or distribution.
     
    References
    1 Hoffman JL, Kaplan S. The incidence of congenital heart disease. J Am Coll Cardiol. 2002;39(12):1890-1900.
    2 McElhinney DB, Hennesen JT. The Melody valve and Ensemble delivery system for transcatheter pulmonary valve replacement. Ann NY Acad Sci.  2013; 1291: 77-85.
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