Which of the following are classified as cardiomyopathies?

The correct classification of cardiomyopathies includes dilated, hypertrophic, restrictive, and ischemic categories.

Dilated cardiomyopathy involves the enlargement and weakening of the heart muscle, which affects the heart's ability to pump blood efficiently. It is one of the most common types of cardiomyopathy. Hypertrophic cardiomyopathy is characterized by the thickening of the heart muscle, which can obstruct blood flow and lead to various cardiac issues. Restrictive cardiomyopathy occurs when the heart muscle becomes rigid and less able to expand, leading to impaired filling of the heart chambers. Ischemic cardiomyopathy results from reduced blood flow to the heart muscle, often due to coronary artery disease, leading to heart dysfunction.

This classification is widely accepted in the field of cardiology since it covers the primary pathological mechanisms and manifestations of heart diseases categorized as cardiomyopathies. Other classifications may include conditions influenced by systemic disease processes or secondary effects, which do not strictly fall under the primary classification of cardiomyopathies.