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Coronary thrombosis is the formation of a blood clot inside a blood vessel of the heart. This blood clot restricts blood flow within the heart. It is associated with narrowing of blood vessels subsequent to clotting. The condition is considered as a type of ischaemic heart disease. Thrombosis in the heart can lead to a myocardial infarction.
If, however, the blockage halts the blood supply to a large area of the myocardium it may be fatal. The main cause of coronary thrombosis is atheroma, a thickening of the blood-vessel walls by fatty and calcium deposits, or plaques. This thickening causes the blood to slow down so that it clots and blocks the artery which may already be narrowed by arteriosclerosis (described below).