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Multi-center, observational post-approval registry to 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. The objective of this post-approval registry is to provide additional real-world evidence of the performance of the OCS Heart System to preserve DBD donor hearts.

This is a pilot/feasibility study on the accuracy of HRV measured by the Apple Watch on the clinical status of patients admitted for acute heart failure decompnsation. We hypothesize that there will be a statistically significant improvement in the HRV that correlates clinically over the course of hospitalization. Meaningful findings from this study will strengthen the potential for a telemonitoring system where HRV measured remotely from home using wearable devices like Apple Watch can help physicians monitoring their health and intervene accordingly.