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Diseases » Heart Attack




Myocardial Infarction (MI) is also known as Heart attack. Arteries which supply blood to heart, sudden narrowing of artery results in sudden stoppage of blood leads to damage called Infarction.

Heart attack is damage to an area of heart muscle caused by lack of oxygen. Heart attack is due to coronary heart disease (CHD). In people with CHD, fatty plaques inside the coronary arteries reduce blood flow, which may cause a temporary lack of oxygen in specific areas of the heart.

Heart attack is caused by rupture of the surface of a fatty plaque. When the plaque ruptures, a blood clot can form that partially or completely blocks the artery. The area of heart muscle fed by the blocked artery is damaged due to a lack of oxygen.

This problem is usually treated by restoring blood flow with a medication that dissolves the clot (a thrombolytic agent) or by opening the artery with a balloon catheter (angioplasty) and inserting a stent. Less commonly, some patients require surgery to bypass the blocked artery.

Heart attack is the leading killer of both men and women. In United States every year for about one million people have heart attacks and half of them die.

Types:

Myocardial Infarction is basically of two types.

Transmural Myocardial Infarction is associated with atherosclerosis involving major coronary artery. It can be further sub divided into Anterior, Posterior, or Inferior.

Subendocardial Myocardial Infarction involves small area in the subendocardial wall of the left ventricle, ventricular septum and papillary muscles.


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