The New York Times Well Blog recently reported on an interesting study...
"Sudden chest pain is the hallmark symptom of a heart attack. But a large new study shows that many people who are taken to hospitals for heart attacks never have chest pain and, as a result, are less likely to be treated aggressively."
Source: http://well.blogs.nytimes.com/2012/02/22/many-heart-attacks-dont-cause-chest-pain/
"Sudden chest pain is the hallmark symptom of a heart attack. But a large new study shows that many people who are taken to hospitals for heart attacks never have chest pain and, as a result, are less likely to be treated aggressively."
Source: http://well.blogs.nytimes.com/2012/02/22/many-heart-attacks-dont-cause-chest-pain/