what is heart attack?when and why does it occur?
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heart attack is a stage when there is a in any coronary artery or in any one or more of their branches there is a deadening of the corresponding area of the heart muscles leading to heart attack.
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Heart attacks most often occur as a result of coronary heart disease(CHD), also called 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.
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