247.7: Trends and Risk Factors for Mortality While Awaiting Heart Transplantation: A UNOS Registry Analysis. (13th September 2022) - Hess, Nicholas; Ziegler, Luke A; Keebler, Mary E; Huston, Jessica H; Hickey, Gavin W; Mathier, Michael A; McNamara, Dennis M; Holtz, Jonathan E; Kaczorowski, David J