URMC / Encyclopedia / Collection Heart Conditions and Diseases Automated External Defibrillator Primary Pulmonary Hypertension (PPH) Atrial Flutter Ventricular Fibrillation (V-fib) Wolff-Parkinson-White Syndrome Ventricular Tachycardia (VT) Heart Block Syncope in Children Long QT Syndrome Congenital Heart Defects