What is known as episodes of cardiac ischemia that occur without chest pain?

Episodes of cardiac ischemia that occur without chest pain are known as silent ischemia. This condition is particularly concerning because individuals may not experience the typical symptoms associated with heart problems, leading to a delayed diagnosis and treatment. Silent ischemia can occur due to a variety of factors, including reduced blood flow to the heart muscle, often caused by coronary artery disease.

In contrast, stable angina is characterized by predictable chest pain that typically occurs with exertion and is relieved with rest. Unstable angina involves chest pain that is more severe, prolonged, and occurs even at rest, indicating a higher risk of a heart attack. Coronary artery disease itself refers to the underlying condition that can lead to ischemia and angina but does not specifically describe episodes of ischemia occurring without pain. Thus, silent ischemia is the term that accurately captures the phenomenon described in the question.