Multi-center, observational post-approval registry to:
1. compare patient and graft survival of adult primary heart transplant recipients receiving DBD donor hearts perfused and assessed on the OCS Heart System compared to adult recipients of DBD donor hearts preserved using ischemic cold storage hearts (Control) at the same Registry centers over the same time period, and
2. compare patient and graft survival of adult primary heart transplant recipients receiving DCD donor hearts perfused and assessed on the OCS Heart System compared to adult recipients of DBD donor hearts preserved using ischemic cold storage hearts (Control) at the same Registry centers over the same time period.