Article: Keeping the beat going; Developing the tools to treat the dangerous heart fluttering known as atrial fibrillation means a big payoff for med-tech firms.(BUSINESS INSIDER)

Byline: JANET MOORE; STAFF WRITER

For about 10 years, Tom Berner felt "a kind of shaking" in his chest between heartbeats.

The 49-year-old Grantsburg, Wis., guidance counselor and football coach figured he was just getting older. But when he went in for a medical procedure last December, a heart monitor told a different story.

He was suffering from atrial fibrillation, a serious but still somewhat obscure heart condition that affects some 3.3 million Americans. Though it sounds like the name of a Bruce Willis action film, "AFib" has become the nation's most commonly diagnosed heart arrhythmia.

It has also become one of the most ...

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