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My Profile Postcards to the President Messages from citizens around the world Watch Now You are here: Home > News > Technology > Article Home Business & Finance News U.S. Politics International Technology Internet Entertainment Sports Lifestyle Oddly Enough Environment Health Science Special Coverage Video Pictures You Witness The Great Debate Blogs Reader Feedback Do More With Reuters RSS Widgets Mobile Podcasts Newsletters You Witness News Make Reuters My Homepage Partner Services CareerBuilder Affiliate Network Professional Products Support (Customer Zone) Reuters Media Financial Products About Thomson Reuters MP3 player headphones may hinder pacemakers: study Sun Nov 9, 2008 10:22am EST Email | Print | Share | Reprints | Single Page [-] Text [+] By Will Dunham WASHINGTON (Reuters) - Headphones used with MP3 digital music players like the iPod may interfere with heart pacemakers and implantable defibrillators, U.S. researchers said on Sunday. The MP3 players themselves posed no threat to pacemakers and defibrillators, used to normalize heart rhythm. But strong little magnets inside the headphones can foul up the devices if placed within 1.2 inches of them, the researchers told an American Heart Association meeting in New Orleans. Dr. William Maisel of the Medical Device Safety Institute at Beth Israel Medical Center in Boston led a team that tested eight models of MP3 player headphones, including clip-on and earbud types, in 60 defibrillator and pacemaker patients. They placed the headphones on the patients' chests, directly over the devices. The headphones interfered with the heart devices in about a quarter of the patients -- 14 of the 60 -- and interference was twice as likely in those with a defibrillator than with a pacemaker. Another study presented at the meeting showed that cellular phones equipped with wireless technology known as Bluetooth are unlikely to interfere with pacemakers. A pacemaker sends electrical impulses to the heart to speed up or slow cardiac rhythm. The magnet, however, could make it deliver a signal no matter what the heart rate is, possibly leading to palpitations or arrhythmia, the researchers said. An implantable cardioverter defibrillator signals the heart to normalize its rhythm if it gets too fast or slow. A magnet could de-activate it, making it ignore an abnormal heart rhythm instead of delivering an electrical shock to normalize it. The devices usually go back to working the right way after the headphones are removed, the researchers said. "The main message here is: it's fine for patients to use their headphones normally, meaning they can listen to music and keep the headphones in their ears. But what they should not do is put the headphones near their device," Maisel said in a telephone interview. So that means people with pacemakers or defibrillators should not place the headphones in a shirt pocket or coat pocket near the chest when they are not being used, drape them over their chest or have others who are wearing headphones rest their head on the patient's chest, Maisel said. Most of the headphones had magnetic field strengths more than 20 times higher than the threshold for interfering with pacemakers or defibrillators, he said. They were made by Sony Corp, Philips Electronics and others. MP3 players like Apple Inc's iPod are popular consumer electronic devices. In January, a U.S. Food and Drug Administration researcher said the iPod is unlikely to interfere with pacemakers because it does not produce enough of an electromagnetic field to interfere with the devices. Brian Markwalter of the Consumer Electronics Association industry group urged consumers to inform themselves about proper use of products with magnets, and encouraged people with pacemakers to understand how headphones can be used safely. (Editing by Maggie Fox) © Thomson Reuters 2008 All rights reserved Share: Del.icio.us Digg Mixx My Web Facebook LinkedIn Next Article: MP3 player headphones may hinder pacemakers -study Also on Reuters Blueprints for Auschwitz camp found in Germany Slideshow First pets: A portrait of White House furry friends Same-sex marriage ban stirs LA gay district protest Editor's Choice Pictures Video Articles Slideshow A selection of our best photos from the past 24 hours. 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