Evaluation of Multisensor Data in Heart Failure Patients With Implanted Devices

Inclusion Criteria: * Age 18 or above, or of legal age to give informed consent specific to state and national law * Willing and capable of returning for all follow-up visits and emergency care at the investigational center as medically appropriate * Willing to participate in all testing associated with this clinical investigation at an approved clinical investigational center * Currently implanted with a COGNIS device (Model N119 or N120, P107, P108) * Classified as NYHA Class II, III or IV within the last six months Exclusion Criteria: * Inability or refusal to sign the Subject Informed Consent * Inability of refusal to comply with the follow-up schedule * Documented as pacemaker dependent * Unable to rest comfortably in a semi-recumbent position for up to 20 minutes * Implanted with active Medtronic Fidelis lead models: 6930, 6931, 6948 or 6949 * Currently implanted with unipolar RA, RV, or LV leads * LV sensitivity programmed to less than 0.7 mV AGC * History of appropriate tachycardia therapy (external or implanted) for rates \< 165 bpm within 1 week prior to enrollment * Device battery status indicates approximate time to explant \< 2 years * Likely to undergo lead or PG revision during the course of the study as determined by the investigator * Receiving regularly scheduled intravenous (IV) inotropic therapy as part of their drug regimen * Have received heart or lung transplant * Receiving mechanical circulatory support * Patients who have been referred or admitted for Hospice care * A life expectancy of less than 12 months per physician discretion * Enrolled in any concurrent study without Boston Scientific written approval * Devices previously converted to the SRD-1 and withdrawn from the study * Received a sub-pectoral COGNIS implant prior to February 1, 2011 with a dash number listed in Appendix K of the study protocol * Known pregnancy or plan to become pregnant within the course of the study * LV offset is programmed to a value greater than zero