Is the chronic kidney disease epidemiology collaboration creatinine-cystatin C equation useful for glomerular filtration rate estimation in the elderly?

Abstract

Background: We aimed to evaluate the performance of the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) creatinine-cystatin C equation in a cohort of elderly Chinese participants. Materials and methods: Glomerular filtration rate (GFR) was measured in 431 elderly Chinese participants by the technetium-99m diethylene-triamine-penta-acetic acid (99mTc-DTPA) renal dynamic imaging method, and was calibrated equally to the dual plasma sample 99mTc-DTPA-GFR. Performance of the CKD-EPI creatinine-cystatin C equation was compared with the CockcroftGault equation, the re-expressed 4-variable Modification of Diet in Renal Disease (MDRD) equation, and the CKD-EPI creatinine equation. Results: Although the bias of the CKD-EPI creatinine-cystatin C equation was greater than with the other equations (median difference, 5.7 mL/minute/1.73 m2 versus a range from 0.4-2.5 mL/minute/1.73 m2; P,0.001 for all), the precision was improved with the CKD-EPI creatinine-cystatin C equation (interquartile range for the difference, 19.5 mL/minute/1.73 m2 versus a range from 23.0-23.6 mL/minute/1.73 m2; P,0.001 for all comparisons), leading to slight improvement in accuracy (median absolute difference, 10.5 mL/minute/1.73 m2 versus 12.2 and 11.4 mL/minute/1.73 m2 for the Cockcroft-Gault equation and the re-expressed 4-variable MDRD equation, P=0.04 for both; 11.6 mL/minute/1.73 m2 for the CKD-EPI creatinine equation, P=0.11), as the optimal scores of performance (6.0 versus a range from 1.0-2.0 for the other equations). Higher GFR category and diabetes were independent factors that negatively correlated with the accuracy of the CKD-EPI creatinine-cystatin C equation (β =-0.184 and -0.113, P,0.001 and P=0.02, respectively). Conclusion: Compared with the creatinine-based equations, the CKD-EPI creatinine-cystatin C equation is more suitable for the elderly Chinese population. However, the cost-effectiveness of the CKD-EPI creatinine-cystatin C equation for clinical use should be considered. © 2013 Liu et al.