What is the definition of cardiac ischemia?

Cardiac ischemia is defined as the irritation of cardiac muscle cells resulting from a lack of oxygen. This condition typically occurs when there is a reduction in blood flow to the heart muscle, which can be caused by various factors, such as narrowed arteries due to atherosclerosis. As oxygen supply to the heart decreases, the muscle cells cannot function properly, leading to symptoms such as chest pain or discomfort, known as angina. Understanding cardiac ischemia is crucial for recognizing potential heart conditions and providing appropriate intervention during emergencies.