Combined inflation and cooling method improves lung function in uncontrolled donation after circulatory death

Area of Science:

• Transplantation immunology
• Organ preservation
• Cardiovascular research

Background:

• Current lung preservation methods, topical cooling and inflation, lead to suboptimal utilization of lungs from uncontrolled donation after circulatory death.
• Long-term warm ischemia, common in out-of-hospital cardiac arrest, further compromises lung viability.
• Improved preservation techniques are crucial to expand the donor lung pool.

Purpose of the Study:

• To evaluate a combined cooling and inflation approach for lung preservation in a swine model.
• To assess the efficacy of this combined method in lungs subjected to prolonged warm ischemia.
• To determine if this novel technique improves post-transplantation lung function and reduces injury.

Main Methods:

• Donor lungs from a swine model were subjected to 1.5 hours of warm ischemia.
• Lungs were divided into three preservation groups: cooling only, inflation only, and combined inflation with cooling for 3 hours.
• Left lung transplantation was performed, followed by 4 hours of functional assessment.

Main Results:

• The combined inflation and cooling group demonstrated significantly better oxygenation post-reperfusion compared to the other groups.
• Superior dynamic lung compliance and reduced lung tissue edema (lower wet/dry weight ratio) were observed in the combined group.
• Histopathological analysis revealed less severe lung injury in the combined inflation and cooling group.

Conclusions:

• The combined inflation and cooling method offers superior pulmonary function and reduced injury compared to existing preservation techniques.
• This approach shows significant potential to mitigate lung deterioration from uncontrolled donation after circulatory death.
• Implementing this technique could lead to increased utilization of donor lungs, addressing organ shortages.