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A leukocyte depleting filter reduces endothelial cell dysfunction and improves transplanted canine heart function
H Yamamoto1, Y Moriyama, K Hisatomi
1Second Department of Surgery, Faculty of Medicine, Kagoshima University, Kagoshima City, Japan. h-yamamoto@h5.dion.ne.jp
Summary
Leukocyte depletion during cardiac transplantation significantly improves graft viability and coronary microcirculation. This method preserves cardiac function and reduces injury by filtering leukocytes from the cardiopulmonary bypass circuit.
Area of Science:
- Cardiovascular Surgery
- Transplantation Immunology
- Microcirculation Research
Background:
- Leukocytes are implicated in reperfusion injury following cardiac transplantation.
- Leukocyte-endothelium interactions are critical in this process.
- Investigating leukocyte depletion (LD) is key to understanding graft viability and microcirculation preservation.
Purpose of the Study:
- To evaluate the efficacy of leukocyte depletion in preserving graft viability.
- To assess the impact of LD on coronary microcirculatory function.
- To determine the role of LD in orthotopic cardiac transplantation models.
Main Methods:
- Orthotopic cardiac transplantation in 10 beagle dogs.
- LD group (n=5) utilized a leukocyte depleting filter in the cardiopulmonary bypass (CPB) circuit.
- Control group (n=5) did not undergo filtration.
Main Results:
- ~80% leukocyte and ~85% neutrophil filtration in the LD group during reperfusion.
- Higher adenosine triphosphate levels and lower polymorphonuclear elastase in the LD group.
- Improved cardiac function (end-systolic pressure-volume relation) and preserved coronary vascular resistance responses in the LD group.
Conclusions:
- Leukocyte depletion via CPB filtration mitigates leukocyte-mediated endothelial injury.
- LD enhances myocardial microcirculation and improves overall graft function.
- Leukocyte depletion is a promising strategy for better outcomes in cardiac transplantation.