Reduce Ventricular Pacing in Dual Chamber Implantable Cardioverter Defibrillators Using AutoIntrinsic Conduction Search Study

Inclusion Criteria: * Patient has been implanted with a dual chamber SJM ICD with AICS for 1 month (± 2 weeks). * At the time of enrollment, patient is paced in the right ventricle (RV) ≤25% of the time as determined by the device diagnostics. * Patient is medically stable. Exclusion Criteria: * Patient has evidence of atrioventricular (AV) block (first, second or third degree) such that ventricular pacing would be required as part of the patient's routine management * Patient is unable to comply with the follow-up visits due to geographical, psychological, or any other reasons. * Patient is younger than 18 years of age. * Patient is pregnant.