Catheter Ablation of Arrhythmias to Improve CRT Response

Inclusion Criteria: * Heart failure patients with CRT-D or CRT-P greater than 3 months * Bi-ventricular pacing less than 94% of the time * 3 months after CRT-D or CRT-P implantation an EF improvement less than 5% * Presence of one of the following arrhythmias and eligible for catheter ablation: * Atrial fibrillation * Atrial flutter * Supraventricular tachycardia * Premature ventricular contraction burden greater than 30% in a 24-hour period * Ventricular tachycardia Exclusion Criteria: * Estimated survival less than one year * Patient unable to make scheduled follow up visits at treating center * Participating in another investigational study