Related Experiment Video
Updated: Aug 18, 2026
In vitro Assessment of Myocardial Protection following Hypothermia-Preconditioning in a Human Cardiac Myocytes Model
Published on: October 27, 2020
Is profound hypothermia required for storage of cardiac allografts?
1Heart Transplant Program, University of Toronto, Ontario, Canada.
Insights
Tepid perfusion using donor blood improves cardiac allograft recovery after prolonged storage. This method enhances myocardial function and metabolism compared to profound hypothermia, offering a promising alternative for organ preservation.
Area of Science:
- Cardiovascular Surgery
- Organ Transplantation
- Organ Preservation
Background:
- Need for improved cardiac allograft protection methods to expand organ availability.
- Previous studies show donor blood perfusion enhances recovery after transplantation.
- Investigating tepid perfusion to avoid hypothermia's detrimental effects.
Purpose of the Study:
- Evaluate if limited coronary perfusion allows prolonged cardiac storage at tepid temperatures.
- Assess if this method avoids detrimental effects of profound hypothermia.
- Compare tepid vs. cold storage outcomes.
Main Methods:
- 14 orthotopic cardiac transplants in pigs.
- Donor blood perfusion during 5-hour storage (tepid 25°C vs. cold 4°C).
- Myocardial metabolism and function assessed after reperfusion.
Main Results:
- Tepid perfusion improved myocardial function recovery (89% vs. 63%, P=.05).
- Aerobic metabolism was better preserved in the tepid group.
- Diastolic compliance was negatively impacted in both groups.
Conclusions:
- Profound hypothermia impairs myocardial recovery post-transplant.
- Limited donor blood perfusion enables tepid storage of cardiac allografts.
- Tepid storage with perfusion improves cardiac allograft performance.
Background:
Improved methods of cardiac allograft protection are required to expand the pool of potentially available organs and to enhance the recovery of grafts subjected to prolonged ischemia. We have previously demonstrated that limited coronary perfusion provided by donor blood harvested at the time of organ procurement can improve both metabolic and functional recovery after transplantation. In this study we evaluated the hypothesis that limited coronary perfusion may enable prolonged cardiac storage while avoiding the potentially detrimental effects of profound hypothermia.
Methods:
Fourteen orthotopic cardiac transplants were performed in female Yorkshire pigs by using donor blood perfusion during 5 hours of either tepid (25 degrees C) or cold (4 degrees C) storage. Assessments of myocardial metabolism and function were performed at baseline and after 45 minutes of normothermic (37 degrees C) reperfusion.
Results:
Hearts protected with tepid perfusion displayed improved recovery of myocardial function (89% +/- 18% vs 63% +/- 25%, P =.05). Diastolic compliance was adversely affected in both groups after transplantation. Aerobic myocardial metabolism was better preserved in the tepid group.
Conclusions:
Profound hypothermia results in depressed myocardial metabolic and functional recovery after transplantation. Limited coronary perfusion with shed donor blood can permit cardiac allograft storage at tepid temperatures, resulting in improved myocardial performance.
More Related Videos
08:15Innovative Strategies for Organ Preservation in Heart Transplantation: Uniform Cooling Preservation and Ex-situ Normothermic Perfusion
Published on: November 28, 2025
07:08A High-Fidelity Porcine Model of Orthotopic Heart Transplantation Following Donation after Circulatory Death
Published on: June 6, 2025