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Programming Implanted Defibrillators to React More Slowly Might Be Safer: Study
Date:5/8/2013

By Serena Gordon
HealthDay Reporter

TUESDAY, May 7 (HealthDay News) -- By slowing down the programmed response rate on implantable cardioverter defibrillators (ICDs), doctors can reduce the number of shocks these devices deliver without causing a significant increase in the risk of fainting or death, new research suggests.

"The aim of [our] study was to evaluate a different programming strategy to reduce unnecessary therapies delivered by the ICD," explained study author Dr. Maurizio Gasparini, chief of the pacing and electrophysiology unit at the Humanitas Clinical and Research Center in Rozzano, Italy.

"The study found that the strategy utilizing a long detection period to recognize arrhythmias [irregular heartbeats] is associated not only to an overall reduction of therapies, but also to less inappropriate shocks experienced by the patients as well as fewer hospitalizations in the 12 months following ICD implant," Gasparini said.

ICDs are small devices implanted in the upper chest. Electrodes from the device are attached to the heart. If an ICD senses a dangerous heartbeat or no heartbeat, it can help correct that through electrical pacing -- like a pacemaker -- or it can deliver a shock to the heart to restore a normal heartbeat, according to the U.S. National Heart, Lung, and Blood Institute.

Results of the study are published in the May 8 issue of the Journal of the American Medical Association. The study was funded by Medtronic Inc., which makes ICDs.

While ICDs can literally be lifesavers, they can also cause problems for some patients.

"Defibrillator shocks, whether for appropriate or inappropriate indications, are associated with adverse effects. These adverse effects include the acute discomfort of the shock, as well as late and longer-lasting psychological trauma including depression and post-traumatic stress disorder," wrote Dr. Merritt Raitt, author of an accompanying
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