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- W2089012864 abstract "To assess the role of reactive oxygen species and nitric oxide (NO) in the genesis of reperfusion-induced arrhythmias, the effects of reactive oxygen species scavengers and NO synthase inhibitors on the incidence of ventricular fibrillation and irreversible ventricular fibrillation (mortality) were examined. Hearts of anesthetized rats were subjected to 4 min regional ischemia followed by 4 min reperfusion. The animals were treated i.v. with superoxide dismutase, a O2- scavenger, catalase, a H2O2 scavenger, dimethylthiourea, a .OH scavenger, or NG-nitro-L-arginine methyl ester (L-NAME) and NG-nitro-L-arginine (L-NNA), NO synthase inhibitors. Superoxide dismutase (430 and 4300 U/kg/min) reduced the mortality from 93% to 43% and 57%, respectively, whereas treatment with catalase or dimethylthiourea did not affect these arrhythmias. L-NAME (0.1 and 0.3 mg/kg/min) reduced the mortality from 93% to 50% and 43%, respectively. L-NNA (0.3 mg/kg/min) reduced the mortality from 93% to 50%. This reduction by the NO synthase inhibitors was abolished by administration of L-Arg. However, L-Arg blocked neither a small increase in systolic blood pressure nor a decrease in heart rate elicited by the NO synthase inhibitors. The combinated treatment of superoxide dismutase (4300 U/kg/min) with L-NAME (0.3 mg/kg/min) reduced the mortality from 93% to 7%. These results suggest that the genesis of reperfusion-induced arrhythmias observed in this model may be in part due to O2- and NO." @default.
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- W2089012864 date "1996-06-01" @default.
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- W2089012864 title "Involvement of superoxide and nitric oxide in the genesis of reperfusion arrhythmias in rats" @default.
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- W2089012864 doi "https://doi.org/10.1016/0014-2999(96)00231-2" @default.
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