Medtronic’s Big CRT-P Study Could See Indication Broadening To Include Mildly Reduced LVEF Patients

In short

Medtronic, Inc. enrolled its first patient in a global clinical trial that will evaluate the effectiveness of cardiac resynchronization therapy-pacemakers (CRT-Ps) in delaying the progression of heart failure in symptomatic patients with mildly reduced heart pumping function.


This large study, tagged MIRACLE EF will be the first to evaluate CRT-P in a widely underserved patient group – those who have a slightly reduced left ventricular ejection fraction (LVEF) in the range of 36 to 50 percent. Medtronic is no doubt hoping for an outcome suggesting that these patients benefit from the device, which would dramatically increase the population of patients for whom the treatment is indicated. The CRT-P devices used in MIRACLE EF are currently not approved by the FDA for the patient population being studied.

Edward Schloss, M.D., FACC, performed the first implant at The Christ Hospital’s Lindner Research Center in Cincinnati; primary investigator for the site is Greg Egnaczyk, M.D., Ph.D., FACC.

Approximately 275 centres throughout the world, in regions including the United States, Canada, Europe, Japan and developing markets, will enroll up to 2,300 patients who will receive a Medtronic Consulta® CRT-P in this prospective, double-blind, randomised controlled trial. Patients will be followed for at least two years or until close of the study. Medtronic anticipates the trial will take four to five years to complete. The effectiveness of CRT-P in this patient population will be assessed using a composite endpoint of time to first event, defined as all-cause mortality or heart failure hospitalization.

Physician comments

“Previous studies have proven the real-world therapeutic benefits of CRT in treating mildly to severely symptomatic heart failure patients with moderately to severely reduced cardiac pumping capacity and electrical dyssynchrony,” said Professor Cecilia Linde, M.D., Ph.D., of Karolinska University Hospital in Stockholm, and worldwide principal investigator in the trial. “Through this large global study we hope to further our research on the overall effectiveness of CRT-P by showing its benefit in treating patients with mild-to-moderate heart failure symptoms, but with milder impairment of heart pumping capacity than previously studied.”

Company comments

“We are hopeful that, when completed, MIRACLE EF will influence clinical practice guidelines regarding the use of advanced cardiac resynchronization devices and potentially lead to another expanded indication for Medtronic CRT devices,” said David Steinhaus, M.D., vice president and general manager, Heart Failure, and medical director for the Cardiac Rhythm Disease Management business at Medtronic. “We look forward to the positive implications these findings could have on heart failure patients whose disease is less pronounced, yet who still experience symptoms and need advanced therapeutic solutions.”

Source: Medtronic Inc.