Silent heart attacks strike without warning
People at risk can appear perfectly healthy, doctors say
Published On: Dec 30 2012 11:25:23 PM CST
Updated On: Dec 30 2012 11:55:51 PM CST
Dec. 30, 2012: It strikes without warning and the symptoms are subtle. But every year, more than 25,000 Americans die from what's called a "silent" heart attack. Rachel McNeill reports.