An electrophysiologist is a cardiologist with a specialization in the diagnosis and treatment of arrhythmias. Electrophysiologists are experts in the heart's conduction system. While there are nearly 100,000 cardiologists in the United States today, there are only about 1,500 electrophysiologists in current practice. Electrophysiology is a relatively new discipline, formed roughly in the late 1970s.
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