Certified Cardiographic Technician (CCT) Practice Exam 2026 – Your All-in-One Guide to Exam Success!

The question pertains to the types of myocardial infarctions and their effects on the layers of the heart muscle. The correct answer indicates subendocardial myocardial infarction, which indeed specifically targets the innermost layer of the myocardium, known as the endocardium.

In subendocardial infarction, there is a decreased blood supply that primarily affects the inner part of the myocardium, resulting in damage that can be somewhat limited compared to transmural infarctions, which damage all layers of the heart muscle from the endocardium to the epicardium. This distinction is important because the extent of the damage impacts the heart's function and prognosis.

Understanding that this type of infarction often arises from conditions like prolonged ischemia (often due to obstructed blood flow) helps to contextualize its consequences. The other types of infarctions listed – transmural, posterior, and anteroseptal – either affect larger portions of the heart muscle or target specific anatomical regions rather than the innermost layer. Thus, recognizing the specific nature of subendocardial infarction is key to understanding its implications in clinical practice.