hello thanks for posting here. myocardial infarction or heart attack is an acute condition where one of the arteries supplying blood to the heart gets completely blocked resulting in deficiency of blood supply to that part of the heart. therefore that part of the heart starts dying and the contracting function of the heart suffers. Great blockages occur as a result of cholesterol deposits in the arteries of the heart. so this cholesterol deposition happens in everyone. but there are also risk factors for developing heart blockages. A strong family history of heart disease can lead to increased deposition of cholesterol deposits and premature heart disease. other risk factors are old age, smoking history, high blood pressure, diabetes, obesity, sedentary life style, male sex, improper diet etc. These all factors lead to increased cholesterol deposition in the arteries which become narrow. As a result when such a person exercises or runs, the blood supply to the heart reduces and hence painter gets chest pain. This is called angina. sometimes when the arteries become very narrow, the blood flow decreases and becomes slow leading to formation of class and total blockage of the blood supply. this is called myocardial infarction. so an angina attack can go away with rest since blood flow is less but not absent, but myocardial infarction doesnt resolve with rest. It requires prompt opening of the artery with either clot buster medications or with interventional procedures. the widow artery is the LAD which supplies almost 60% of the heart muscle and most often is fatal, hence called widow artery. Treatment of myocardial infarction is clot buster medications, blood thinners, international procedures like primary angioplasty, bypass surgery in some cases, blood thinner medications, anticholesterol medications, anti angina medications and drugs which help maintain heart shape and size after a heart attack. ( prevent remodeling of the heart) .