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• W2038663536 abstract "Background. Ischemia-reperfusion injury continues to represent a significant challenge to successful lung transplantation. Traditional pulmonary ischemic protection is performed using hypothermic hyperkalemic depolarizing solutions to reduce the metabolic demands of the ischemic organ. Measures to further reduce the effects of ischemic injury have focused on the reperfusion period. We tested the hypothesis that novel physiologic hyperpolarizing solutions—using ATP-dependent potassium channel (KATP) openers—given at the induction of ischemia, will reduce cellular injury and provide superior graft function even after prolonged periods of ischemia. Methods. An isolated blood-perfused ventilated rabbit lung model was used to study lung injury. Airway, left atrial, and pulmonary artery pressures were measured continuously during the 2-h reperfusion period. Oxygenation, as a surrogate of graft function, was measured using intermittent blood gas analysis of paired left atrial and pulmonary artery blood samples. Graft function was measured by oxygen challenge technique (FiO2 = 1.0). Wet-to-dry ratio was measured at the conclusion of the 2-h reperfusion period. Control (Group I) lungs were perfused with modified Euro-Collins solution (depolarizing) and reperfused immediately (no ischemia). Traditional protection lungs were perfused with modified Euro-Collins flush solution and stored for 4 h (Group II) or 18 h (Group III) at 4°C before reperfusion. Novel protection (Group IV) lungs were protected with a hyperpolarizing solution containing 100 nM Aprikalim, a specific KATP channel opener, added to the modified Euro-Collins flush solution and underwent 18 h of ischemic storage at 4°C before reperfusion. Results. Profound graft failure was measured after 18 h of ischemic storage with traditional protection strategies (Group III). Graft function was preserved by protection with hyperpolarizing solutions even for prolonged ischemic periods (Group IV). Wet-to-dry weight ratio, airway, left atrial, and pulmonary artery pressures were not significantly different between the groups. Conclusions. We have created a model of predictable lung injury. Membrane hyperpolarization with a KATP channel opener (PCO) provides superior prolonged protection from ischemia-reperfusion injury in an in vitro model of pulmonary transplantation." @default.
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• W2038663536 date "2003-01-01" @default.
• W2038663536 modified "2023-10-18" @default.
• W2038663536 title "Novel protection strategy for pulmonary transplantation" @default.
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• W2038663536 doi "https://doi.org/10.1016/s0022-4804(02)00045-8" @default.
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