Which term is the umbrella for angina and myocardial infarction?

• A. Stable angina
• B. Myocardial infarction
• C. Acute coronary syndrome (ACS)
• D. Hypoglycemia

Answer: (C)

Acute coronary syndrome is the umbrella term for conditions caused by a sudden reduction in blood flow to the heart, including unstable angina and myocardial infarction (both STEMI and NSTEMI). These conditions share a common acute event—plaque rupture leading to thrombosis and ischemia—and are treated as a group until tests separate them. Stable angina, by contrast, is a chronic, predictable chest pain pattern from fixed narrowing and isn’t an acute event, so it isn’t part of ACS. Hypoglycemia isn’t related to coronary events. The strength of ACS as the umbrella is that it covers the spectrum of acute ischemic presentations and directs the urgent evaluation and management needed.