Question:hard
Infarcts involving which portion of the myocardium most commonly cause a ventricular aneurysm as a post-MI complication?
Infarcts involving which portion of the myocardium most commonly cause a ventricular aneurysm as a post-MI complication?
Show Hint
True LV aneurysm follows antero-apical (LAD) transmural infarction.
Updated On: Jun 23, 2026
- Subendocardial
- Anterior transmural
- Posterior transmural
- Inferior wall
Show Solution
The Correct Option is B
Solution and Explanation
Step 1: Ask which infarct thins the whole wall and sits where the ventricle stretches most. That is a transmural infarct of the anterior wall and apex.
Step 2: The LAD supplies the anterior wall, septum and apex. When it occludes, the resulting antero-apical transmural infarct heals into a thin scar that balloons out in systole, the textbook true aneurysm.
Step 3: Subendocardial infarcts keep an intact outer layer and resist outpouching. Inferior and posterior infarcts (right coronary or circumflex territory) seldom give aneurysms; they more often cause issues like papillary muscle or conduction problems.
Step 4: The matching choice is the anterior transmural infarct. (The printed recall key marks Inferior wall, but the very explanation given describes antero-apical LAD-territory infarction, so the medically correct answer is anterior transmural.)
\[\boxed{\text{Anterior transmural}}\]
Step 2: The LAD supplies the anterior wall, septum and apex. When it occludes, the resulting antero-apical transmural infarct heals into a thin scar that balloons out in systole, the textbook true aneurysm.
Step 3: Subendocardial infarcts keep an intact outer layer and resist outpouching. Inferior and posterior infarcts (right coronary or circumflex territory) seldom give aneurysms; they more often cause issues like papillary muscle or conduction problems.
Step 4: The matching choice is the anterior transmural infarct. (The printed recall key marks Inferior wall, but the very explanation given describes antero-apical LAD-territory infarction, so the medically correct answer is anterior transmural.)
\[\boxed{\text{Anterior transmural}}\]
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