Studies on Total Body, Serum and Erythrocyte Potassium in Patients on Maintenance Haemodialysis. The Value of Erythrocyte Potassium as a Measure of Body Potassium

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Abstract
Total body, Erythrocyte and Serum potassium changes during haemodialysis were studied on 29 occasions in 15 patients on maintenance dialysis with a low dialysate potassium concentration (1 mEq/l). The loss in total body potassium during haemodialysis (measured with a whole body counter) varied widely and was significantly related to the pre-dialysis body potassium state of the patient as assessed by total body potassium per kg body weight in spite of a constant high serum to dialysate concentration gradient in all patients. Serum potassium levels did not correlate well with changes in total body potassium or erythrocyte potassium. Erythrocyte potassium was shown to be a reliable and useful index of the direction and magnitude of changes in total body potassium during haemodialysis.

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