نام فایل : بيماري قلبي 3

فرمت : .doc

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حجم : 75 کیلوبایت

A heart attack is when low blood flow causes the heart to starve for oxygen. Heart muscle dies or becomes permanently damaged. Your doctor calls this a myocardial infarction
Causes
Most heart attacks are caused by a blood clot that blocks one of the coronary arteries. The coronary arteries bring blood and oxygen to the heart. If the blood flow is blocked, the heart starves for oxygen and heart cells die.
A clot most often forms in a coronary artery that has become narrow because of the build-up of a substance called plaque along the artery walls. (See:
atherosclerosis
) Sometimes, the plaque cracks and triggers a blood clot to form.
Occasionally, sudden overwhelming
stress
can trigger a heart attack.
It is difficult to estimate exactly how common heart attacks are because as many as 200,000 to 300,000 people in the United States die each year before medical help is sought. It is estimated that approximately 1 million patients visit the hospital each year with a heart attack. About 1 out of every 5 deaths are due to a heart attack.
Risk factors for heart attack and coronary artery disease include:
Bad genes (hereditary factors)
Being male
Diabetes

Getting older
High blood pressure

Smoking

Too much
fat
in your diet
Unhealthy
cholesterol
...