The Orange County Heart Institute and Research Center is a medical group that specializes in the prevention, diagnosis, treatment, education and rehabilitation of heart-related diseases. The center provides arrhythmia consultation, electrophysiology and transseptal left heart mapping for individuals with cardiac rhythm disorders. Its diagnostic cardiac services include treadmill stress testing, stress echocardiogram and nuclear cardiology. The Orange County Heart Institute and Research Center specializes in angiography, which is a noninvasive test that visualizes coronary arteries and bypass grafts using the electron beam computed tomography scan and intravenous dye injection. The center s cardiologists specialize in balloon angioplasty and laser athrectomy. It is located in Orange, Calif.