What distinguishes stable angina from unstable angina?

Stable angina is characterized by chest pain that typically occurs with exertion or stress and is relieved by rest or the use of nitroglycerin. This pattern indicates that stable angina is predictable and manageable, which contrasts with unstable angina, where chest pain may occur at rest, is unpredictable, and does not consistently respond to rest or medication.

The ability of stable angina to resolve with rest and the administration of nitroglycerin is a key feature that differentiates it from unstable angina. In unstable angina, the pain can occur more frequently, last longer, and be more intense, signaling a potential progression towards myocardial infarction. Thus, the resolution of chest pain with rest and nitroglycerin clearly indicates a stable pattern indicating stable angina. This reliable symptom pattern is crucial for diagnosis and management.