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Cardiology is a medical specialty dealing with disorders of the heart. The speciality includes diagnosis and treatment of congenital heart defects, coronary artery disease, heart failure, valvular heart disease and electrophysiology. Physicians who specialize in this field of medicine are called cardiologists. Physicians who specialize in cardiac surgery are called cardiac surgeons. Cardiology is concerned with the normal functionality of the heart and the deviation from a healthy heart.