Which condition is characterized by a decrease in oxygen supply to the heart muscle?

Myocardial ischemia is a condition that occurs when there is a decrease in blood flow to the heart muscle, leading to a reduced supply of oxygen to the heart. This can happen due to various factors, including blockages in the coronary arteries, which supply blood to the heart. Inadequate oxygenation can cause chest pain or discomfort, often referred to as angina, and may lead to more severe conditions if left untreated.

Myocardial infarction, commonly known as a heart attack, occurs when there is a complete blockage that prevents blood flow to a part of the heart muscle for a prolonged period, resulting in damage to the tissue. While myocardial infarction is associated with ischemia, it represents a more severe and acute stage involving cell death.

Atrial fibrillation is an arrhythmia characterized by irregular heartbeats, but it does not directly relate to oxygen supply reduction. Although it can be associated with other conditions that may affect heart function, it is not defined by a decrease in oxygen supply.

Heart failure is a condition in which the heart is unable to pump effectively, leading to insufficient blood flow to meet the body's needs. While it can result in complications related to oxygen supply, it is more of a chronic condition encompassing a range