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anatomy angiogram angiography aorta arrhythmias atria atrial atrium bicuspid biology birth blood cardiologist cardiomyopathy cava chamber circulation congenital defect deformity diagnose diagnostic echocardiography electrocardiogram endocarditis examination fallot heart hypertrophy inferior insufficiency left medical mitral pericarditis prolapse pulmonary right science secundum septal stenosis stethoscope superior syndrome tetralogy tof transthoracic tricuspid valve vena ventricle ventricles ventricular