Trends and Outcomes of Cardiac Transplantation in the Lowest Urgency Candidates

Area of Science:

• Cardiology
• Transplantation Medicine
• Health Services Research

Background:

• Cardiac transplantation faces donor supply shortages, necessitating prioritization of medically urgent patients.
• Understanding the characteristics and outcomes of lower urgency heart transplant recipients is crucial for optimizing organ allocation.
• Previous research has not fully elucidated the differences between lowest and highest medical urgency candidates.

Purpose of the Study:

• To compare clinical characteristics, organ allocation patterns, and outcomes of lowest versus highest medical urgency heart transplant candidates.
• To analyze these differences before and after the 2018 organ allocation system change.
• To identify potential disparities in the heart transplant process.

Main Methods:

• Retrospective analysis of the United Network for Organ Sharing (UNOS) database.
• Inclusion of patients listed for cardiac transplantation between January 2011 and May 2020.
• Stratification of patients by medical urgency status at transplantation and comparison across different time periods.

Main Results:

• Lower urgency recipients were older and more often female compared to highest urgency recipients in both allocation systems.
• Donors for lower urgency recipients had higher rates of comorbidities (older age, female sex, viral hepatitis, diabetes).
• Lowest urgency patients experienced longer wait times but received organs from shorter distances with reduced ischemic times under the new system.

Conclusions:

• Heart transplant recipients with lower medical urgency receive organs from donors with more comorbidities.
• Despite donor and allocation differences, 1-year post-transplantation survival is comparable between lowest and highest urgency groups.
• The findings suggest that current allocation strategies achieve similar short-term outcomes across different medical urgency levels.