International Thoracic Organ Transplant (TTX) Registry
TThe mission of the TTX Registry is to advance the understanding and outcomes of thoracic transplantation through the systematic collection, analysis, and dissemination of high-quality international data. The Registry provides a collaborative platform for participating centers and investigators to identify trends, evaluate outcomes, conduct meaningful research, and develop evidence-based practices that improve care for patients undergoing thoracic transplantation.
Goals
The primary goal of the TTX Registry is to establish and maintain a comprehensive, high-quality international database of thoracic transplantation activity and outcomes. By ensuring complete, accurate, and consistent data submission, the Registry enables participating centers and investigators to better understand outcomes, identify opportunities for improvement, and contribute to research that advances the field of thoracic transplantation.
Purpose
The TTX Registry seeks to:
- Capture comprehensive international data related to thoracic transplantation, including patient characteristics, transplantation activity, management, and outcomes.
- Identify risk factors associated with complications, morbidity, mortality, and long-term outcomes.
- Improve patient selection and clinical management before and after transplantation.
- Evaluate trends and variations in transplantation practices and outcomes across centers and regions.
- Generate predictive models and risk-adjustment methodologies to better understand and anticipate patient outcomes.
- Provide a robust data foundation for research studies, clinical investigations, publications, and guideline development.
- Identify and promote best practices with the goal of improving quality of care and patient outcomes.
- Support benchmarking and continuous quality improvement among participating centers.
- Facilitate international collaboration and accelerate the development of knowledge in thoracic transplantation.
Benefits to Centers
- Benchmark your center’s performance against international transplantation experience and outcomes.
- Access meaningful data and statistical summaries to better understand your center’s patient population, activity, and outcomes.
- Identify opportunities for quality improvement through analysis of trends, outcomes, and practice patterns.
- Support research and publications using a robust, multinational dataset.
- Contribute to the development of evidence-based practices and standards in thoracic transplantation.
- Identify trends in patient and transplant characteristics to support program planning and resource allocation.
- Strengthen your center’s participation in the international transplant community through collaboration and shared learning.
Benefits to ISHLT
- Maintain and strengthen a high-quality international thoracic transplantation registry.
- Provide a comprehensive data resource to support ISHLT research, education, guidelines, and advocacy initiatives.
- Enable researchers to conduct multinational analyses and collaborative studies.
- Generate statistical reports and research insights that advance the Society's mission in thoracic transplantation.
- Strengthen ISHLT's role as a leader in international transplant outcomes research and quality improvement.
Benefits to the Thoracic Transplantation Community
- Improve patient outcomes through greater understanding of risk factors, practices, and outcomes.
- Accelerate research and innovation by providing investigators with access to high-quality international data.
- Identify and disseminate best practices across transplant programs worldwide.
- Establish international benchmarks and standards for thoracic transplantation.
- Support evidence-based decision-making for clinicians, programs, researchers, and policymakers.
- Foster international collaboration and a shared understanding of challenges and opportunities in thoracic transplantation.
- Ultimately, advance the field and improve the lives of patients receiving thoracic transplants.
Registry Resources
International Thoracic Organ Transplant (TTX) Registry Slides
The TTX Registry is pleased to share analyses of the TTX Registry data available to members, health care providers, and the public. The information includes recipient and donor characteristics, annual trends in selected characteristics, and post-transplant survival data stratified by age group (adult and pediatric) and organ type (heart and lung).
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2024 Annual Report from the ISHLT International Thoracic Organ Transplant Registry
This comprehensive report includes newly submitted data from 12 global partners and covers heart and lung transplantations from 1992 to 2024.
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TTX Registry Report: Early Renal Failure After Primary Thoracic Organ Transplantation
This is a special report from the International Society for Heart and Lung Transplantation (ISHLT) International Thoracic Organ Transplant (TTX) Registry focuses on renal failure after thoracic organ transplantation.
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International Thoracic Organ Transplant (TTX) Registry) Data Fields / Look Up Tables / Forms
Spreadsheets providing the list of data fields that the TTX Registry collects.
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International Thoracic Organ Transplant (TTX) Registry Data Use Agreement
Individuals requesting standard deidentified datasets will be required to sign a Data Use Agreement (DUA) before receiving the dataset.
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International TTX Registry Steering Committee Charter
Composition, aims and responsibilities for the TTX Registry Steering Committee.
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International Thoracic Organ Transplant (TTX) Registry Data Request Policy
All requests for data and/or analysis from the International Thoracic Organ Transplant (TTX) Registry must be submitted using the ISHLT Data/Analysis Request Form.
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International Thoracic Organ Transplant (TTX) Registry Enrollment Policy
All institutions and countries performing heart, heart-lung, and/or lung transplantation are invited to submit data to the ISHLT TTX Registry through a data sharing arrangement with the regional/national Data Collectives or Registry Partners.
Registry News
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Thoracic Transplantation Around the Globe: An ISHLT2025 Registry Special Session Recap15 May 2025The ISHLT International Thoracic Organ Transplant (TTX) Registry hosted a special session at ISHLT2025 in Boston to highlight the recent progress in international data sharing with the ISHLT Registry following the challenges of evolving privacy regulations.
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2023 International Thoracic Organ Transplant (TTX) Registry Report16 April 2025The 2023 International Thoracic Organ Transplant (TTX) Registry Report is now available. This is a special report focuses on renal failure after thoracic organ transplantation.
Data Coordinating Center
The Data Coordinating Center (DCC) for the TTX Registry is the United Network for Organ Sharing (UNOS). UNOS hosts the database and manages the collection and analysis of the data. Questions about the TTX Registry and the data submission process may be directed to ishlthelp@unos.org.
TTX Registry Steering Committee

The TTX Registry Steering Committee is responsible for the oversight of the registry's operation and monitoring its ongoing progress.
Questions?
Contact Olivia Penninger at +1-312-224-1253 or send an email to olivia.penninger@ishlt.org.

