OK, the study group was getting up there in age– 67 to 93-years-old–but the implications are a bit disturbing: most heart attacks are never recognized as heart attacks. HealthDay reports that when researchers used sophisticated MRI scans to spot heart trouble among more than 900 older Icelanders, they found that 91 had heart attacks that had been diagnosed, while 157 had heart attacks that had not been recognized. Should we worry? Maybe. The researchers also found that more than six years of follow-up, 33 percent of those who had recognized heart attacks died, as did 28 percent of those with unrecognized heart attacks. Of those who had never had a heart attack, only 17 percent died. Read more in HealthDay.