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• W1981181666 abstract "Background: In experimental studies, exposure to hyperoxia for a limited time before ischaemia induces a low‐grade systemic oxidative stress and evokes an (ischaemic) preconditioning‐like effect of the myocardium. We hypothesised that hyperoxia before cardioplegia could protect the myocardium against necrosis and stunning caused by ischaemia–reperfusion. Methods: Forty patients undergoing coronary artery bypass grafting were randomly exposed to an oxygen fraction of 0.4 or >0.96 in inspired air on an average of 120 min before cardioplegia. Blood for troponin I, creatine kinase‐MB, lactate, glutathione and interleukin‐6 was sampled from arterial and coronary sinus cannulae during 20 min of reperfusion. Additional arterial samples were drawn 60 min after declamping and in the first post‐operative morning. The cardiac index and right and left ventricular stroke work indices were measured before sternotomy and up to 12 h post‐operatively. Results: Troponin I, creatine kinase‐MB and lactate did not differ between the groups. Hyperoxic pre‐treatment had no impact on the post‐operative haemodynamic indices measured with the thermodilution pulmonary artery catheter. More oxidised glutathione was released in the hyperoxia group in the first minute of reperfusion ( P = 0.015). Hyperoxic pre‐treatment abolished the myocardial release of interleukin‐6 during 20 min of reperfusion ( P = 0.021 vs. controls). In the first post‐operative morning, interleukin‐6 was higher in the hyperoxia group [127.0 (86.0–140.0) vs. 85.2 pg/ml (66.6–94.5 pg/ml); P = 0.016]. Conclusions: Exposure to >96% oxygen before cardioplegia did not attenuate ischaemia–reperfusion injury of the heart in patients undergoing coronary artery bypass grafting. The only potentially beneficial effect observed was the decreased transmyocardial release of interleukin‐6." @default.
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• W1981181666 date "2007-10-18" @default.
• W1981181666 modified "2023-10-10" @default.
• W1981181666 title "Pre-treatment with hyperoxia before coronary artery bypass grafting - effects on myocardial injury and inflammatory response" @default.
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• W1981181666 doi "https://doi.org/10.1111/j.1399-6576.2007.01444.x" @default.
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