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2017 ; 10
(5
): 395-403
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Does Secretory Clearance Follow Glomerular Filtration Rate in Chronic Kidney
Diseases? Reconsidering the Intact Nephron Hypothesis
#MMPMID28675584
Chapron A
; Shen DD
; Kestenbaum BR
; Robinson-Cohen C
; Himmelfarb J
; Yeung CK
Clin Transl Sci
2017[Sep]; 10
(5
): 395-403
PMID28675584
show ga
Drug-dose modification in chronic kidney disease (CKD) utilizes glomerular
filtration rate (GFR) with the implicit assumption that multiple renal excretory
processes decline in parallel as CKD progresses. We compiled published
pharmacokinetic data to evaluate if GFR predicts renal clearance changes as a
function of CKD severity. For each drug, we calculated ratio of renal clearance
to filtration clearance (Rnf). Of 21 drugs with Rnf >0.74 in subjects with GFR
>90 mL/min (implying filtration and secretion), 13 displayed significant change
in Rnf vs. GFR (slope of linear regression statistically different from zero),
which indicates failure of GFR to predict changes in secretory clearance. The
dependence was positive (n = 3; group A) or negative (n = 10; group B). Eight
drugs showed no correlation (group C). Investigated drugs were small molecules,
mostly hydrophilic, and ionizable, with some characterized as renal transporter
substrates. In conclusion, dosing adjustments in CKD require refinement; in
addition to GFR, biomarkers of tubular function are needed for secreted drugs.