How do you tell the differences between each type of cardiomyopathy?

Several ways: A patient's history and family history often provide clues to the type of cardiomyopathy as does a physical examination. The diagnostic tests that may be recommended include electrocardiogram, chest x ray, echocardiogram and mri. Genetic testing is becoming more useful. Very rarely, more invasive studies such as cardiac catheterization and myocardial biopsy may be recommended.