The goal of this observational study is to learn about the impact of donor heart procurement time based on circadian rhythm on the long-term outcomes of heart transplant recipients. The main question it aims to answer is: Does the time of day when a donor heart is procured-specifically during the circadian repression phase (00:00-12:00) versus the activation phase (12:00-00:00)-affect post-transplant survival and rejection rates in patients with end-stage heart failure? Patients undergoing heart transplantation at the study hospital will have leftover donor heart tissue and preservation fluid collected during surgery for multi-omics analysis. These participants will then be followed prospectively for up to three years to track survival and rejection outcomes.
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Overall survival
Timeframe: From date of transplantation up to 3 years post-transplant.