CCM OPEN HF Registry

Inclusion Criteria: * Patients who have /will be implanted with Impulse Dynamics CCM technologies (e.g. CCM or CCM-D when available) as determined by investigators * Willing and able to provide informed consent, including for use of data for research purposes (e.g. publication, sub-studies/sub-analyses) Exclusion Criteria: * Noncompliant patients (e.g. for follow-up visits, medication, etc.) as determined by investigators. * Subjects with a mechanical tricuspid valve