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Instant Index: Smart Chip Senses Oncoming Heart Attack

David Muir reveals the top stories that have people buzzing this week.
01:07 | 03/24/2013

Transcript for Instant Index: Smart Chip Senses Oncoming Heart Attack

We turn, now, to our "instant" index on a sunday night. And a tiny chip that can could one day save lives. Scientists say it could be a powerful weapon against heart attacks. The device implanted just... See More
This transcript has been automatically generated and may not be 100% accurate.
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