Question

Infarcts involving which portion of the myocardium cause aneurysm as a postMI complication

• A. Subendocardial
• B. Anterior transmural
• C. Posterior transmural
• D. Inferior wall

Answer 1

The Correct Option is D

Myocardial infarction (MI) can lead to complications such as an aneurysm. An aneurysm resulting from an MI typically occurs in the inferior wall of the myocardium. This is because the inferior wall, often affected by transmural infarctions, is prone to weakening and dilation over time, leading to the formation of an aneurysm.

To understand why the inferior wall is particularly vulnerable, consider the following factors:

• Transmural infarcts, which affect the full thickness of the myocardial wall, can compromise the structural integrity of soft muscle tissues.
• The inferior wall may experience persistent blood flow stresses post-infarction, increasing the risk of aneurysmal stretching.

Other regions like the anterior transmural and posterior transmural areas, while affected by MIs, are less commonly associated with aneurysm formation compared to the inferior wall. Subendocardial infarcts are less likely to result in an aneurysm, as they do not affect the entire wall thickness.