Which cardiovascular condition occurs when blood flow to a section of heart muscle becomes blocked (usually by a clot), potentially causing heart muscle damage and death?

Congestive heart failure is a chronic condition where the heart is unable to pump blood effectively, resulting in fluid buildup and reduced blood flow. Unlike a myocardial infarction, it is not directly caused by a blockage in blood flow but rather by the heart's decreased efficiency over time due to various underlying conditions.

Angina pectoris is characterized by chest pain or discomfort due to reduced blood flow to the heart muscle, often triggered by physical activity or stress. However, it does not result in the permanent damage associated with myocardial infarction, as the blood flow restriction is typically temporary and reversible.

Atrial fibrillation is an irregular and often rapid heart rate that can lead to various complications, including stroke, but it does not specifically involve the blockage of blood flow to the heart muscle. Instead, it pertains to the electrical signals in the heart and can sometimes contribute to the risk of a myocardial infarction.