There are two types of cardiac MRI: contrast is required to look at the myocardium; contrast is not required, it is not required to visualize the myocardium, or not at all. The heart includes the pericardial cavity, epicardium, endocardium, myocardium, heart valves, and tendon cords. The heart has a pumping function that relies on the myocardium constantly contracting and diastolic. The heart muscle itself has two conditions: how thick the heart muscle is, how thick the heart muscle contraction is, how thick the heart muscle diastole is, and whether the signals of the heart muscle itself are normal, all of which can be seen without medication. This change indicates whether the myocardial blood perfusion is normal, myocardial infarction or fresh myocardial infarction, or whether there is old myocardial infarction. This is the distinction between administering drugs and not administering drugs. You should take the medication when you should, and not when you shouldn’t.