LAUSR

New-onset atrial fibrillation (AF) is commonly detected in patients with an implantable cardiac device. Appropriate evaluation of these patients includes a search for “reversible” causes that eventually might preclude the need for rate or rhythm control and, importantly, oral anticoagulation. We present the case of a patient with new-onset AF attributed to a premature ventricular complex (PVC) response algorithm that resulted in atrial pacing-induced long–short sequences. In this case, disabling the PVC response algorithm successfully prevented further AF.