Confirm Rx™ Versus Reveal LINQ™ - Which is More Reliable in Data Transmission? A Randomized Clinical Study

Inclusion Criteria: * Patient is 18 years of age or older * Patient is willing and able to provide written informed consent * Patient is willing and able to comply with the protocol, including follow-up visits and MyCareLink™ and Merlin™ transmissions (standard of care) * Candidates for implantable cardiac monitor Exclusion Criteria: * Patient is enrolled in another study that could confound the results of this study, without documented pre-approval from a study manager * Patient has existing IPG, ICD, CRT-D or CRT-P device * Adequate sensing in one week post implant. If sensing not adequate, patient will be in the registry.