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• W2085780829 abstract "Effects of yohimbine (YHMB, an α 2 -antagonist) and desipramine (DMI, a neuronal uptake inhibitor) were compared on cardiac noradrenaline (NA) release either upon left ansa subclavia nerve stimulation during acute occlusion of the left anterior descending coronary artery (LAD) or upon subsequent LAD reperfusion without stimulation in anesthetized dogs. In control dogs, before LAD occlusion, coronary sinus (CS) NA output increased from 5.4 ± 1.0 to 26.8 ± 4.0 ng/min (p < 0.05) upon stimulation (2 Hz, 30 s). The response to stimulation remained unchanged 25 min after LAD occlusion. During reperfusion 60 min after occlusion, the output of CS-NA and lactate increased from 6.1 ± 0.8 to 51.3 ± 19.4 ng/min (p < 0.05) and from 2.7 ± 0.5 to 6.7 ± 1.3 mg/min (p < 0.05), respectively. In dogs treated with YHMB, the stimulation-induced increase in NA output was potentiated at least fourfold (p < 0.05) either before or during LAD occlusion, but not during reperfusion. In dogs receiving DMI, stimulation-induced CS-NA output was enhanced to a similar extent (approximately twofold, p < 0.05) either before or during occlusion, while reperfusion-induced NA output was markedly potentiated by approximately ninefold (p < 0.05). Maximum dP/dt of left ventricular pressure remained unchanged upon reperfusion in all groups. The total arrhythmic ratio in the drug-treated groups did not significantly differ from the ratio in control dogs upon either stimulation or reperfusion. The data suggest that an abrupt increase in NA output upon reperfusion may result from a washout of NA locally accumulated in the ischemic and (or) peri-ischemic region during the preceding occlusion period, and that N A thus released does not have substantial hemodynamic effects. The results indicate that in the presence of YHMB or DMI, the potentiated increase in NA release in response to either nerve stimulation during LAD occlusion or to reperfusion without stimulation did not aggravate ventricular arrhythmia, most probably owing to the antiarrhythmic properties of these substances." @default.
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• W2085780829 date "1987-11-01" @default.
• W2085780829 modified "2023-10-14" @default.
• W2085780829 title "Effects of yohimbine and desipramine on cardiac noradrenaline release and ventricular arrhythmias during acute coronary artery occlusion and reperfusion in anesthetized dogs" @default.
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• W2085780829 doi "https://doi.org/10.1139/y87-355" @default.
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