Abstract
Evaluation of renal function should be performed as part of the follow-up during and after chemotherapy in pediatric cancer patients. The aim of this study was to compare an isotope clearance method [isotope glomerular filtration rate (iGFR)] with alternative methods to determine GFR in such patients. Isotope GFR [(99m)Tc-labeled diethylene triaminopentoacetic acid (DTPA) or (51)Cr-labeled ethylenediaminetetra-acetate (EDTA)] was measured in 36 children (112 studies) and compared with simultaneously measured creatinine clearance (CrCl), serum creatinine (SCr), and cystatin C (CysC) concentrations, as well as the results of Schwartz, Counahan-Barratt, and Cockroft-Gault formulae, using general linear mixed models. Our results showed a significant association between iGFR and CysC concentrations (p < 0.001). No linear relationship was observed between CrCl and iGFR (p = 0.7). As expected, the results of height-based formulae (Counahan-Barratt and Schwartz) had significantly (p = 0.004) better correlation to iGFR than the results of a formula based on weight (Cockroft-Gault) (p = 0.19). Despite significant linear correlation, intraclass correlation coefficients showed poor agreement. Tests of similarity between iGFR estimates show...Continue Reading
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