Heart Attack
A heart attack (myocardial infarction) occurs when blood flow to the heart is blocked due to a blood clot. Without oxygen, the section of the heart muscle that needs the oxygen begins to die.
More than 1 million people in the US suffer from a heart attack, and about half of them will die. Half of those deaths happen within 1 hour of the start of symptoms and before reaching the hospital.
If you or someone you know might be having a heart attack, call 911 immediately.
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