Silent Heart Attack: Like a Time Bomb

Unusual or nonexistent symptoms make it no less dangerous.

But one-quarter of heart-attack sufferers experience different symptoms or no symptoms. Some learn theyve had a heart attack (myocardial infarction, or MI) when a test performed for another reason reveals the damage. Others find out when they develop symptoms of heart failure, such as shortness of breath or leg swelling, or an arrhythmia (palpitations or fainting).
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