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[JimH]

From 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.

Full article:
http://www.reuters.com/article/domesticNews/idUSTRE4A81SS20081109

[glynor]

If those kind of magnets can mess them up, it sounds like the Pacemakers aren't designed that well.  What about being near a computer monitor?  Or standing in front of a big floor speaker (or a big 10-12" sub)?