What are the three states that define acute coronary syndrome?

Acute coronary syndrome (ACS) encompasses a spectrum of conditions resulting from reduced blood flow to the heart muscle, typically due to coronary artery disease. The three states that define ACS are STEMI (ST-Elevation Myocardial Infarction), NSTEMI (Non-ST Elevation Myocardial Infarction), and unstable angina.

• STEMI is characterized by the presence of significant ST-segment elevation on an electrocardiogram (ECG), indicating complete blockage of a coronary artery and resulting in substantial heart muscle damage.

• NSTEMI, on the other hand, does not present ST-segment elevation but still involves myocardial ischemia and tissue damage, often with elevation of cardiac biomarkers like troponin, differentiating it from stable angina and unstable angina.

• Unstable angina is defined by the occurrence of chest pain at rest or a change in the pattern of angina that is more frequent, prolonged, or severe than the patient's usual experience. It's a critical condition indicating an impending risk of myocardial infarction.

The other options include terms that do not completely specify the correct categories of ACS or incorporate conditions that do not fall under the ACS classification. Stable angina, for instance, is a stable condition characterized