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. 1994 Dec;113(4):1167–1172. doi: 10.1111/j.1476-5381.1994.tb17120.x

Attenuation of the antiarrhythmic effects of ischaemic preconditioning by blockade of bradykinin B2 receptors.

A Vegh 1, J G Papp 1, J Parratt 1
PMCID: PMC1510497  PMID: 7534181

Abstract

1. The possibility that bradykinin is involved in the pronounced antiarrhythmic effects of ischaemic preconditioning in anaesthetized mongrel dogs was examined with the use of the selective B2 antagonist, icatibant (Hoe-140). 2. Preconditioning, achieved by two 5 min occlusions of the left anterior descending coronary artery, followed 20 min later by a 25 min occlusion of the same artery resulted, during this prolonged occlusion, in less severe arrhythmias (VF 0% versus 47% in control non-preconditioned dogs), reductions in the incidence and number of episodes of ventricular tachycardia (VT) and in the number of ventricular premature beats and increased survival following reperfusion (50% versus 0% in the controls). 3. Hoe-140 was given in a dose of 300 micrograms kg-1 either before the preconditioning procedure or after preconditioning but before the prolonged occlusion. This dose of Hoe-140 had insignificant haemodynamic effects and failed to modify the increase in coronary blood flow that occurred in the circumflex coronary artery when the anterior descending branch was occluded. 4. It was difficult to precondition dogs in the presence of Hoe-140. There were more ventricular arrhythmias during the initial 5 min occlusion (44 +/- 12 versus 10 +/- 3) and a higher incidence of ventricular fibrillation (50% versus 21%) during the preconditioning procedure. There was also a more pronounced ST-elevation (recorded from epicardial electrodes) during the preconditioning occlusions in those dogs given Hoe-140. 5. In those dogs that survived to the long (25 min) occlusion, Hoe-140 prevented the antiarrhythmic effects of preconditioning (reduction in ventricular premature beats and in VT) although all the dogs survived the occlusion period.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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