Southern California EMS Midterm Practice Test

The key idea is the difference between reversible ischemia and actual tissue death. Angina arises from transient myocardial ischemia that is enough to cause chest pain but not long enough to kill heart muscle; rest or nitroglycerin typically relieves it and the tissue remains viable. Acute myocardial infarction, on the other hand, involves ischemia that is prolonged and severe enough to cause myocardial cell death due to a blocked coronary artery. That distinction between reversible ischemia (angina) and irreversible injury (AMI) is what the statement is capturing. Relying on “risk factors” like high cholesterol or high blood pressure oversimplifies things and isn’t the defining difference between these conditions. Angina does not involve tissue death, whereas AMI does, and both conditions can occur at various times—not strictly at night or during exercise. In practice, recognizing the difference matters for management: angina often responds to rest or nitro (when appropriate), while AMI requires urgent transport and more intensive interventions.