What Is a Heart Attack?
| Title: | What Is a Heart Attack? |
| URL: | http://www.nhlbi.nih.gov/health/dci/Diseases/HeartAttack/HeartAttack_WhatIs.html |
| Description: | A heart attack occurs when the supply of blood and oxygen to an area of heart muscle is blocked, usually by a clot in a coronary artery. mn_whatis |
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