In Tom Smith's encounter, which diagnosis represents an acute myocardial infarction?

In Tom Smith's encounter, which diagnosis represents an acute myocardial infarction?

• A. Acute lateral wall myocardial infarction
• B. Unstable angina
• C. Atrial fibrillation
• D. Coronary artery disease

Answer: (A)

An acute myocardial infarction means heart muscle death due to a sudden loss of blood flow from a blocked coronary artery. When the infarction involves the lateral wall of the left ventricle, it’s usually from occlusion of the left circumflex artery, and the typical ECG pattern is ST-segment elevations in lateral leads I, aVL, and V5–V6, with cardiac biomarkers elevated to confirm necrosis. Among the options, “acute lateral wall myocardial infarction” best fits an acute infarct of the lateral wall. Unstable angina describes ischemia without myocardial necrosis (biomarkers may be normal), atrial fibrillation is an arrhythmia, and coronary artery disease is a chronic condition that can predispose to MI but is not itself an acute infarct.

An acute myocardial infarction means heart muscle death due to a sudden loss of blood flow from a blocked coronary artery. When the infarction involves the lateral wall of the left ventricle, it’s usually from occlusion of the left circumflex artery, and the typical ECG pattern is ST-segment elevations in lateral leads I, aVL, and V5–V6, with cardiac biomarkers elevated to confirm necrosis. Among the options, “acute lateral wall myocardial infarction” best fits an acute infarct of the lateral wall. Unstable angina describes ischemia without myocardial necrosis (biomarkers may be normal), atrial fibrillation is an arrhythmia, and coronary artery disease is a chronic condition that can predispose to MI but is not itself an acute infarct.