Chicago - Almost half of all heart attacks cause no obvious symptoms, yet they can still be life-threatening, according to research on more than 9,000 middle-aged men and women.

It’s one of the biggest studies to examine so-called silent heart attacks, and to also explore them across racial and gender groups.

Researchers at Wake Forest University’s medical school led the government-funded study. Results were published online Monday in the American Heart Association’s journal, Circulation.

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