a heart attack can occur if what becomes blocked and prevents backflow to the myocardium
1 A heart attack can then occur if the blood clot completely blocks the passage of oxygen-rich blood to the heart. 2  If the artery becomes completely blocked after gradual buildup of plaque due to atherosclerosis. 3  Heart attack may occur if not enough oxygen containing blood can flow through this blockage. A heart attack happens when the flow of oxygen-rich blood to a section of heart muscle suddenly becomes blocked and the heart can't get oxygen. If blood flow isn't restored quickly, the section of heart muscle begins to die. A heart attack happens when the flow of oxygen-rich blood to a section of heart muscle suddenly becomes blocked and the heart can't get oxygen. A heart attack happens when the flow of oxygen-rich blood to a section of heart muscle suddenly becomes blocked and the heart can't get oxygen. If blood flow isn't restored quickly, the section of heart muscle begins to die. Heart attacks are a leading killer of both men and women in the United States. A heart attack, or myocardial infarction (MI), occurs when the supply of blood and oxygen to an area of heart muscle is blocked. A clot (or thrombus) is the final product of the blood coagulation (thickening). Specifically, a thrombus is a blood clot in an intact blood vessel. A heart attack, also called a myocardial infarction, is death of or damage to part of the heart muscle due to an insufficient blood supply. Heart attacks occur when one of the coronary arteries that supply blood to the heart muscle is blocked. A heart attack can occur when coronary arteries become blocked due to coronary artery disease (CAD). This blockage is due to a build-up of fat-like deposits (plaque) on the artery walls. This process is called atherosclerosis. As plaque builds up, the artery narrows and blood flow is reduced (See Figure 2). About Heart Attack. A heart attack happens when the flow of oxygen-rich blood to a section of heart muscle suddenly becomes blocked and the heart can't get oxygen. If blood flow isn't restored quickly, the section of heart muscle begins to die. A heart attack can occur when coronary arteries become blocked due to coronary artery disease (CAD). This blockage is due to a build-up of fat-like deposits (plaque) on the artery walls. This process is called atherosclerosis. If the flow of oxygen-rich blood to your heart muscle is reduced or blocked, angina (an-JI-nuh or AN-juh-nuh) or a heart attack can occur. Angina is chest pain or discomfort. It may feel like pressure or squeezing in your chest. The pain also can occur in your shoulders, arms, neck, jaw, or back.
Coronary artery