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• W2078086149 abstract "Maintenance of adequate electrical activity of the heart depends critically on the ability of the Na-K pump to compensate for normal passive sodium and potassium fluxes. Using sudden injections of [3H]ouabain into the left coronary artery in anaesthetized open-chest pigs, we monitored transient changes in myocardial potassium balance by PVC-valinomycin mini-electrodes. When related to the number of pumps blocked and fractional inhibition, these data provided estimates of total Na-K pump capacity as well as actual pump rate and perturbations of the Na-K balance. Experiments were performed in hearts with and without intracoronary isoprenaline infusion (2.5 nmol min-1). After injection of 120 nmol [3H]ouabain into the left coronary artery, myocardial [3H]ouabain concentrations were 118 (74–178) and 103 (76–145) pmol g-1 and total concentrations of [3H]oubain binding sites were 893 (752–1076) and 785 (691–877) pmol g-1 (median, 95% confidence interval) in isoprenaline-treated and control hearts respectively (differences not significant). The [3H]ouabain injection caused a net potassium release of 81 (56–132) and 43 (23–75) μcool 100 g-1 (median, 95% confidence interval) in isoprenaline-treated and control hearts respectively (n= 6–8; significance of difference, P= 0.03). Na–K pump rate estimated from mono-exponential release curves was 6363 (3942–10,858) K+ ions min-1 site-1 during β-adrenoceptor stimulation and 2514 (1380–4322) in control (significance of difference, P= 0.03). This corresponds to 40 and 16%, respectively, of the maximum possible pump rate determined from ATP hydrolysis. Comparison of accumulated potassium release and relative Na-K pump rate indicates that catecholamines enhance the sensitivity of the Na-K pump for intracellular sodium." @default.
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• W2078086149 date "1989-04-01" @default.
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• W2078086149 title "In-vivoquantification of myocardial Na-K pump rate during β-adrenergic stimulation of intact pig hearts" @default.
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• W2078086149 doi "https://doi.org/10.1111/j.1748-1716.1989.tb08608.x" @default.
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