INSIGHTS ICD Registry

Inclusion Criteria: * Patients 18 years of age or older. * Patients or legal guardians who are willing and able to sign a Permission for Access to and Use of Health Information in a Registry Form and, if required by an Institution's IRB, an Informed Consent. * New or replacement implants of Medtronic market released single, dual or triple chamber ICDs including: GEM VR, GEM DR, GEM III AT, Marquis VR, Marquis DR, Maximo DR, Maximo VR, InSync ICD, InSync Marquis ICD and InSync II Marquis ICD. Exclusion Criteria: * Patients enrolled in a device study which effects programming and or treatment.