TITLE

Exaggerated carbohydrate-induced calciuria in the remaining kidney of transplant donors

AUTHOR(S)
Boner, Geoffrey; Newton, Margaret; Rieselbach, Richard E.
PUB. DATE
January 1973
SOURCE
Kidney International;Jan1973, Vol. 3 Issue 1, p24
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Calcium excretion by the remaining kidney of transplant donors must double in order to maintain homeostasis, assuming that calcium accession from gut and bone is unaltered following unilateral nephrectomy. We have performed clearance studies on 12 donors and six normal subjects in order to characterize the pattern of calcium excretion by the remaining donor kidney as compared to normals, and to determine if an alteration in the calciuric response to carbohydrate ingestion occurs in this setting. Urinary calcium excretion in the remaining donor kidney exceeded that of one kidney in normals by approximately two-fold. Increased excretion was due to an increase in Filtered load of calcium associated with an increase in fractional excretion. A similar increase in the rates of magnesium, phosphate, sodium and potassium excretion was also observed in donor kidneys. Following ingestion of 150 g of glucose, the maximum absolute increment in the rate of donor kidney calcium excretion was 108 greater than that observed in each kidney of normals. Also, there was an associated accentuation of the normal carbohydrate-induced effect upon magnesium and potassium excretion. Thus, the remaining kidney of transplant donors maintains homeostasis by doubling solute excretion. In addition, the observed exaggerated effect of carbohydrate ingestion on calcium as well as magnesium and potassium excretion is suggestive of altered metabolic activity within adapted nephrons of the remaining donor kidney.
ACCESSION #
18287457

 

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