Cardiology is a medical specialty and a branch of internal medicine concerned with disorders of the heart. It deals with the diagnosis and treatment of such conditions as congenital heart defects, coronary artery disease, electrophysiology, heart failure and valvular heart disease. Subspecialties of the cardiology field include cardiac electrophysiology, echocardiography, interventional cardiology and nuclear cardiology. Vascular medicine or angiology is the medical specialty concerned with the functioning and diseases of the lymphatic and circulatory systems, which include veins, arteries and small blood vessels (microcirculation). A vascular specialist is also sometimes referred to as an angiologist. As the circulatory system connects all organs, vascular medicine lies at the crossroads of many other fields , including: • Vascular surgery • Interventional radiology • Internal medicine • Cardiology • Neurology • Dermatology • Nephrology and diabetology.