Modification of diet in renal disease versus chronic kidney disease epidemiology collaboration equation to estimate glomerular filtration rate in obese patients
[en] Background Obesity is a recognized risk factor for both the development and progression of chronic kidney disease (CKD). Accurate estimation of glomerular filtration rate (GFR) is thus important in these patients. We tested the performances of two creatinine-based GFR estimates, the Modification of Diet in Renal Disease (MDRD) and the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equations, in an obese population.
Methods Patients with body mass index (BMI) > 30 kg/m2 were included. The reference method for measured GFR (mGFR) was 51Cr-EDTA (single-injection method, two blood samples at 120 and 240 min). Both indexed and non-indexed results were considered. Serum creatinine was measured using the IDMS-traceable compensated Jaffe method. Mean bias (eGFR–mGFR), precision (SD around the bias) and accuracy within 30% (percentage of estimations within 30% of mGFR) were calculated for both equations.
Results The population included 366 patients (185 women) from two different areas. Mean age was 55 ± 14 years, and mean BMI was 36 ± 7 kg/m2. Mean mGFR was 56 ± 26 mL/min/1.73 m2 (71 ± 35 mL/min without indexation). In the total population, mean bias was +1.9 ± 14.3 and +4.6 ± 14.7 mL/min/1.73 m2 (P < 0.05), and accuracy 30% was 80 and 76% for the MDRD and CKD-EPI equations (P < 0.05), respectively. In patients with mGFR > 60 mL/min/1.73 m2, mean bias was +4.6 ± 18.4 and +9.3 ± 17.2 mL/min/1.73 m2 (P < 0.05), and accuracy 30% was 81 and 79% (NS) for the MDRD and CKD-EPI equations, respectively.
Conclusions The CKD-EPI equation did not outperform the MDRD study equation in this population of obese patients
Disciplines :
Urology & nephrology Laboratory medicine & medical technology
Author, co-author :
BOUQUEGNEAU, Antoine ; Centre Hospitalier Universitaire de Liège - CHU > Frais communs médecine
Vidal-Petiot, Emanuelle
Vrtovsnik, François
CAVALIER, Etienne ; Centre Hospitalier Universitaire de Liège - CHU > Chimie médicale
RORIVE, Marcelle ; Centre Hospitalier Universitaire de Liège - CHU > Diabétologie,nutrition, maladies métaboliques
DELANAYE, Pierre ; Centre Hospitalier Universitaire de Liège - CHU > Néphrologie
Flamant, Martin
Language :
English
Title :
Modification of diet in renal disease versus chronic kidney disease epidemiology collaboration equation to estimate glomerular filtration rate in obese patients
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