The main cause of Heart attack (myocardial infarction) is the blockage of an artery that supplies blood to the heart. When this occurs, a sudden blockage of the coronary arteries, muscle cells of the heart is no longer able to obtain enough oxygen and because of the delayed recovery of blood supply die.
Usually the artery obstruction is caused by a blood clot. Clot is coagulated blood that obstructs the lumen of the artery and cut offso the blood flow. Clots formed in the coronary arteries due to rupture of a formation called plaque.
The plaque, created by progressive accumulation of lipids, which are deposited on the walls of the artery. The creation of the plate:atherosclerosis, progressively narrows the artery. The rupture of atherosclerotic plaque can occur suddenly.
The blockage may be caused by inflammation, muscle spasm in the artery, slit-separation vessel, embolism, thrombus migration.
