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• W2016367458 abstract "Polyethylene glycol, covalently linked to superoxide dismutase (PEG-SOD), has a long plasma half-life (greater than 30 hours) and has been proposed as an effective agent for reducing free radical-mediated injury ischemia and reperfusion.Using an isolated rabbit heart perfused with arterial blood from a support rabbit, we have demonstrated that pretreatment with PEG-SOD (30,000 units/kg, intravenous bolus, 12-24 hours before 60 minutes of normothermic global ischemia), combined with addition of PEG-SOD to the blood perfusion circuit (30,000 units/kg to the support rabbit) and inclusion of PEG-SOD (150 micrograms/ml) in a cardioplegic solution, enhanced the postischemic recovery of left ventricular developed pressure (LVDP) from 51 +/- 6 to 74 +/- 9 mm Hg (p less than 0.05; n = 9 per group). In further studies we showed that, whereas maximum protection was obtained when PEG-SOD was given as a combined pretreatment and additive to both the cardioplegic and the reperfusate solutions (postischemic LVDP recovery increased from 44 +/- 4% in the control group to 70 +/- 3% in the PEG-SOD group), the administration of PEG-SOD during pretreatment plus cardioplegia or during reperfusion alone also resulted in a significant improvement in postischemic function (62 +/- 7% and 60 +/- 3%, respectively). However, the use of PEG-SOD as a cardioplegic additive alone failed to afford protection (47 +/- 4% recovery of LVDP). In dose-response studies (with 0, 3,000, 6,000, 12,000, 30,000, or 60,000 units/kg; n = 8 per group), maximum recovery of LVDP was obtained with the administration of 12,000 units/kg of PEG-SOD. Studies of the plasma activity of PEG-SOD confirmed its long half-life and showed that the treatment with PEG-SOD either 1 hour or 12-24 hours before the study resulted in similar levels of plasma activity. In an attempt to assess any involvement of blood-borne elements in the protection afforded by PEG-SOD, studies were also carried out in the crystalloid-perfused rabbit heart, and no protection was observed. Similarly, no protection was observed at any one of a variety of doses in the crystalloid-perfused rat heart.PEG-SOD can afford protection in the blood-perfused rabbit heart; this protection is dose dependent and probably involves some action of PEG-SOD on blood-borne elements, possibly leukocytes." @default.
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• W2016367458 date "1992-08-01" @default.
• W2016367458 modified "2023-10-12" @default.
• W2016367458 title "PEG-SOD and myocardial protection. Studies in the blood- and crystalloid-perfused rabbit and rat hearts." @default.
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• W2016367458 doi "https://doi.org/10.1161/01.cir.86.2.672" @default.
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