Novel Multi-Modality Assessment of Arrhythmic Risk and Disease Progression in Repaired Tetralogy of Fallot Undergoing Redo-Pulmonary Valve Surgery Using 4D Cardiac MRI Flow and High Density 3D Electro-Anatomical Mapping.

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Sudden death from arrhythmia is the most common cause of death in adults with tetralogy of Fallot, a type of congenital heart disease. It has been shown that dangerous arrhythmias can be induced in almost half of these patients when severe pulmonary valve disease is present. Our study will evaluate the potential for arrhythmias both before and after pulmonary valve surgery, using MRI and electrophysiological testing, to determine if these patients require defibrillators.