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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Modification of ventricular fibrillation latency following coronary artery occlusion in the conscious pig.

Abrupt occlusion of the left anterior descending coronary artery was performed on 45 unanesthetized farm pigs in order to evaluate the relative effects on the latency to ventricular fibrillation (VFL) of 1) adaptation of the animals to the laboratory, and 2) beta-receptor blockade by propranolol. Compared to control values, VFL was greatly lengthened (i.e., VF delayed or prevented) by adaptation (P smaller than 0.01), was shortened by large (2 MG/KG) doses of racemic propranolol in unadapted animals (P smaller than 0.02), and was again increased while under the influence of the drug, by adaptation (P smaller than 0.051). Neither a lower (0.02 mg/kg) dose of racemic propranolol, 2 mg/kg of dextropropranolol, nor ventricular pacing to a higher heart rate had an effect on VFL. The results suggest that reduced psychological stress was very effective in retarding or preventing the onset of VF, that low doses of propranolol were ineffective, and that higher doses were deleterious in unadapted animals.[1]


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