Abstract
1 The influence of potassium loading on the renal excretion of sodium, potassium and solute during high rate vasopressin administration has been investigated in sheep. 2 Adrenalectomized sheep were infused with 0.43 M KCl at 2 ml/min for 2-2.5 hours. Coincident with the rise in plasma potassium concentration, the urinary excretion of sodium, potassium, solute and water was increased as was the reabsorption of solute-free water. The rates of urinary excretion of sodium and potassium, osmolal clearance (COsm) and solute-free water reabsorption (TcH2O) for the first 50 min of potassium infusion were each found to be linearly related to the plasma potassium concentration. 3 After 50 min an infusion of vasopressin at 1 or 4 mu/min was superimposed on the potassium infusion for a period of 30 minutes. The administration of vasopressin was consistently associated with further augmentation of potassium excretion and clearance, of osmolal clearance and of solute-free water reabsorption to values above those anticipated from the pre-vasopressin regression lines for these parameters. Urinary sodium showed a coincident depression in the rate of excretion and clearance during the same period. 4 Thirty to fifty minutes after the cessation of vasopressin infusion the potassium and sodium excretions had returnied to values which approximated the pre-vasopressin relations between plasma potassium and the urinary excretions of these ions. 5 Both rates of vasopressin infusion were equally effective in increasing the potassium clearance. Any differences in clearance between the two rates of vasopressin administration were not statistically significant. 6 The large increments in potassium excretion (averaging greater than 40%) were interpreted as indicating that, when vasopressin is present at high concentrations, the distal tubule is one site of action of the hormone in the nephron of sheep.
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