Abstract
A recent study has shown in the conscious dog that hypoxia associated with respiratory acidosis could increase the in vivo distribution of digoxin in the myocardium. The aim of the present study was to evaluate in vitro the effects of hypoxia and (or) hypercapnic acidosis on the digoxin uptake. For this purpose, rat myocardium was incubated for 180 min with radiolabelled [3H]digoxin. The uptake of digoxin which was expressed in nanograms of digoxin bound per 100 mg of myocardium was decreased by hypoxia and increased by hypercapnic acidosis. The association of hypoxia and hypercapnic acidosis had no effect on the digoxin uptake, suggesting that in vitro hypoxia acts in an opposite way to hypercapnia.
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