A heart
attack happens when the flow of oxygen-rich blood to a section of heart muscle
suddenly becomes blocked and the heart can’t get oxygen. If blood flow isn’t
restored quickly, the section of heart muscle begins to die.
Heart attacks most
often occur as a result of
coronary artery disease. CHD is a condition in which a waxy substance called
plaque builds up inside the coronary arteries. These arteries supply
oxygen-rich blood to your heart.
When there is a
buildup of plaque over many years, an area of plaque can rupture inside of an artery. This causes a blood clot
to form on the plaque's surface. If the clot becomes large enough, it can
mostly or completely block blood flow through a coronary artery.
If the blockage
isn't treated quickly, the portion of heart muscle fed by the artery begins to
die. Healthy heart tissue is replaced with scar tissue. This heart damage may
not be obvious, or it may cause severe or long-lasting problems.
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