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- W2053014259 abstract "The aim was to determine whether the antiarrhythmic effects of preconditioning are modified by blockade of K+ATP channels with glibenclamide in a model (anaesthetised dogs) in which this procedure has previously been shown to prevent the effects of preconditioning in reducing myocardial infarct size.10 mongrel dogs were preconditioned by two 5 min occlusions of the left anterior descending coronary artery, separated by a 20 min reperfusion period, and then subjected, 20 min later, to a prolonged (25 min) occlusion and to subsequent reperfusion. In another 10 dogs glibenclamide (300 micrograms.kg-1) was given by intravenous injection both after the first preconditioning stimulus and before the prolonged occlusion. Control dogs (25) were subjected to a 25 min occlusion followed by reperfusion; five of these dogs also received glibenclamide.Preconditioning reduced the severity of ventricular arrhythmias, epicardial ST segment elevation, and the degree of inhomogeneity of conduction. The antiarrhythmic effect of preconditioning was attenuated by glibenclamide (twice as many ventricular premature beats and more episodes of ventricular tachycardia) but there was no modification of preconditioning induced reduction in ventricular fibrillation either during ischaemia or during reperfusion, or on survival (0% in controls; 50% in preconditioned dogs with or without glibenclamide). Glibenclamide did, however, prevent the effects of preconditioning on the inhomogeneity of conduction and, less markedly, on epicardial ST segment elevation.In a similar model to that in which it has previously been shown that glibenclamide prevents the effect of preconditioning in reducing myocardial infarct size (suggesting involvement of K+ATP channels), the most pronounced antiarrhythmic effects of preconditioning (reduction in ventricular fibrillation; increase in survival) were not modified by glibenclamide. This, and other evidence, suggests that the mechanisms of the protective effect of preconditioning in reducing the severity of arrhythmias and on infarct size are not the same." @default.
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- W2053014259 date "1993-04-01" @default.
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- W2053014259 title "Are ATP sensitive potassium channels involved in the pronounced antiarrhythmic effects of preconditioning?" @default.
- W2053014259 doi "https://doi.org/10.1093/cvr/27.4.638" @default.
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