Calcium channel blockers decrease the plasma potassium concentration in acutely nephrectomized rats exposed to an acute potassium load. We examined the effect of verapamil on the plasma potassium concentration during an acute potassium load in anephric-uremic diabetic and non-diabetic rats. The plasma potassium concentration was measured at 15-min intervals during 60 min of continuous KCl infusion, with and without verapamil. The baseline potassium concentrations were higher in diabetic rats vs. nondiabetic controls. Verapamil blunted the increase in plasma potassium in diabetic and nondiabetic rats compared with the respective controls. The pH and hematocrit were similar in all groups. We conclude that the effect of verapamil on extrarenal potassium disposal are independent of insulin and the renin angiotensin system in the uremic state.
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