Which type of myocardial infarction is documented as nontransmural?

The designation of a nontransmural myocardial infarction refers specifically to a type of heart tissue damage that does not extend through the full thickness of the myocardial wall. A subendocardial myocardial infarction affects only the inner layer of the heart muscle. In this case, the term "subendocardial" indicates that the infarction is localized to the subendocardial region, which is the area closest to the inner lining of the heart.

This classification is essential because it differentiates between the extent of injury to the heart tissue and helps guide clinical management and treatment strategies. In contrast, a transmural myocardial infarction involves the full thickness of the myocardial wall, which is more severe and can lead to more significant cardiac damage and complications.

The mention of anemia and secondary neoplasm in the choices provided does not relate to the classification of myocardial infarctions. Anemia is a condition characterized by a deficiency in red blood cells, while secondary neoplasm refers to cancer that has spread from another part of the body. Neither of these options relates to the concept of myocardial infarction types.