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Weight loss linked to higher risk with implanted defibrillators
Date:3/7/2013

SAN FRANCISCO (March 7, 2013) Even minor weight loss is associated with worse health outcomes among patients implanted with a certain type of defibrillator known as cardiac resynchronization therapy with defibrillator (CRT-D), according to research being presented at the American College of Cardiology's 62nd Annual Scientific Session.

People with symptoms of heart failure who have an implantable CRT-D device may believe that losing weight will ultimately improve their long-term health outcomes. However, in the first study to look at weight loss and subsequent health outcomes among patients with a CRT-D, researchers found the opposite may be true.

"In patients with heart failure who receive a cardiac resynchronization device with defibrillator, unintended weight loss of just five pounds increases the risk of a serious cardiac event," said Valentina Kutyifa, MD, postdoctoral research associate at the University of Rochester Medical Center and the lead author of the Multicenter Automatic Defibrillator Implantation with Cardiac Resynchronization Therapy (MADIT-CRT) trial. "These findings suggest clinicians should be monitoring patients with unplanned weight loss more closely."

Among the subset of patients who had a specific heart condition called a left bundle branch block, the risk of heart failure or death with weight loss doubled. CRT-D devices work by emitting small electronic impulses to coordinate the heart's rhythm and improve the ability of the heart to pump blood in patients with heart failure, and by attempting to shock the heart back into a normal rhythm when dangerous heart rhythms are detected. CRT-Ds comprise one-third of all pacemakers.

In this study, nearly 1,000 patients who received a CRT-D were observed at 12 months after implantation. Of these, nearly one in five (17 percent) had lost more than 2 kilograms, or 4.4 pounds, during that time. These patients had a significant increase in their risk of heart fai
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Contact: Beth Casteel
bcasteel@acc.org
240-328-4549
American College of Cardiology
Source:Eurekalert

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