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- W2000210343 abstract "The effect of intravenous isoproterenol on the energy requirements for successful defibrillation (DF) was examined in anesthetized dogs following cholinergic blockade with atropine (n = 5) and following treatment with d- and d,l-sotalol (n = 16). Defibrillation shocks were administered through left and right ventricular epicardial patch electrodes and the energy requirements for DF were studied using two different methods. Multiple shocks of varying energies were delivered and the energies required for 50% success (E50) and 80% success (E80) in DF were estimated using logistic regression. Atropine (0.04 mg/kg) increased E50 by 32 +/- 30% (p = 0.046) and E80 by 39 +/- 38% (p = ns). Subsequent administration of isoproterenol (10 micrograms/ml), increasing the heart rate by 52 +/- 35% (p = 0.025), resulted in a further 108 +/- 21% (p = 0.015) and 88 +/- 55% (p = 0.02) rise in E50 and E80 values, respectively. In a second set of experiments, d- (n = 9) and d,l-sotalol (n = 7) (4 mg/kg bolus followed by 0.025 mg/kg/min maintenance infusion) were administered and baseline curves relating delivered energy to % success in DF were calculated. Isoproterenol (10 +/- 4 micrograms/min) was given to increase the heart rate by 54 +/- 32% (p less than 0.025), and resulted in decreases in % success at each of two energy levels, falling in the midrange of the dose-response curve. Following d,l-sotalol, % successful shocks fell from 60 +/- 15 to 42 +/- 28% (p less than 0.05); following d-sotalol, the % success fell from 66 +/- 13 to 38 +/- 36% (p less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2000210343 date "1992-02-01" @default.
- W2000210343 modified "2023-10-16" @default.
- W2000210343 title "Isoproterenol Increases Defibrillation Energy Requirements in Dogs" @default.
- W2000210343 doi "https://doi.org/10.1097/00005344-199202000-00008" @default.
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