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Costlier Heart Device May Not Be Worth It, Study Suggests
Date:5/14/2013

By Brenda Goodman
HealthDay Reporter

TUESDAY, May 14 (HealthDay News) -- Patients prone to dangerously fast heart rhythms may get just as much help and have fewer complications with less-expensive implanted defibrillators that run one wire to the heart instead of two, a new study shows.

Implantable cardioverter defibrillators, or ICDs, are like having an emergency "crash cart" in the chest. The devices can sense runaway heart rhythms and deliver powerful shocks to jolt the heart back to a normal, steady pace.

Studies have shown that the devices cut deaths in patients at risk for sudden cardiac arrest because their heart muscles are too weak to effectively pump blood throughout the body, a condition called cardiomyopathy.

But little evidence exists to help doctors decide when it's better to choose a single-chambered ICD for patients or the more complex dual-chambered model.

The study, published in the May 15 issue of the Journal of the American Medical Association, compared the fates of more than 32,000 Medicare patients who received ICDs, from 2006 through 2009. None of the patients also needed a pacemaker, a device that speeds up a slow heartbeat.

"There is evidence for greater risk of complications. Not clear evidence of benefit. That risk-benefit ratio really doesn't support the routine use of dual-chamber devices for primary prevention," said study co-author Dr. Pamela Peterson, an associate professor of medicine at the University of Colorado at Denver.

About one-third of patients received a single-chamber ICD, in which an electrical lead is attached to the heart's lower right pumping chamber. The other two-thirds got dual-chamber devices, in which wires are attached to the upper and lower chambers of the heart's right side.

After a year, patients who got single-chamber ICDs were no more likely to die or be hospitalized than patients who got the more expensive dual-chamber mo
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