MCQs of myocardial infarction with answers
Myocardial Infarction—50 MCQs with Answers Section 1: Basic Concepts (1–10) Which of the following arteries is most commonly occluded in myocardial infarction? A. Left circumflex artery B. Right coronary artery C. Left anterior descending artery D. Posterior descending artery ✅ Answer: C Myocardial infarction is most commonly caused by: A. Coronary artery spasm B. Embolism C. Atherosclerotic plaque rupture with thrombus D. Vasculitis ✅ Answer: C Which enzyme rises earliest after MI? A. Troponin I B. CK-MB C. Myoglobin D. LDH ✅ Answer: C Which cardiac marker remains elevated the longest after an MI? A. Myoglobin B. Troponin I C. CK-MB D. AST ✅ Answer: B Which of the following ECG changes is seen in the early stage of MI? A. ST depression B. T-wave inversion C. ST elevation D. U waves ✅ Answer: C The term “silent MI” refers to: A. MI without ECG changes B. MI without elevated enzymes C. MI without chest pain D. MI with heart murmurs only ✅ A...