The HFRS PAS is a global, prospective, observational, multi-site study. Patients implanted with a Medtronic Cobalt™ XT CRT (with Attain StabilityQuad™ MRI SureScan™ Model 4798 Lead (ASQ)) or ICD device who are enrolled in the Medtronic CareLink (CL) Network and the PSR will be followed per the standard of care practices of their care provider.
