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Calcium channel blocker enhances lung preservation
S Sasaki1, K Yasuda, J D McCully
1Department of Cardiovascular Surgery, Hokkaido University, Sapporo, Japan.
Summary
Calcium channel blockers, like nifedipine, significantly improved early lung graft function after preservation compared to prostaglandin E1 (PGE1) in a rat lung transplant model. This suggests nifedipine is more effective for reducing vasoconstriction during lung flushing.
Area of Science:
- Transplantation immunology
- Cardiovascular research
- Pulmonary medicine
Background:
- Standard lung transplantation protocols use prostaglandin E1 (PGE1) for donor lung pretreatment, but its effectiveness is debated.
- Calcium channel blockers have shown promise in mitigating potassium-induced vasoconstriction.
Purpose of the Study:
- To investigate the efficacy of a calcium channel blocker in the initial lung flush solution for rat lung transplantation.
- To compare the effects of nifedipine versus PGE1 on early lung graft function.
Main Methods:
- Rat lungs (n=30) were flushed with University of Wisconsin solution (UWS) alone, UWS + PGE1, or UWS + nifedipine.
- Stored lungs were reperfused using an isolated, pulsatile blood-perfused lung model for 2 hours.
- Assessed parameters included blood gas analysis, shunt fraction, airway resistance, dynamic compliance, and pulmonary vascular resistance.
Main Results:
- Lungs flushed with UWS + nifedipine demonstrated significantly higher pO2 levels (85.1 mmHg) at 30 minutes post-reperfusion compared to UWS (49.6 mmHg) and UWS + PGE1 (52.0 mmHg) groups.
- The nifedipine group showed superior shunt fraction, lung airway resistance, and dynamic lung compliance.
- Control lungs (immediate reperfusion) had the highest pO2 (88.0 mmHg).
Conclusions:
- Flushing donor lungs with UWS containing nifedipine significantly enhances early graft function after 24-hour storage.
- Calcium channel blockers are more effective than PGE1 in preventing potassium-induced vasoconstriction in lung preservation.
- Optimizing lung flush solutions may involve combining calcium channel blockers for vasodilation with PGE1 for non-vasodilatory pulmonary protection.