Abstract
Background
Estimated glomerular filtration rate (eGFR) is the sole diagnostic criterion for stage 3a chronic kidney disease (CKD). Because eGFR decreases with age, its prognostic utility in the elderly is controversial. Albuminuria is an important prognostic factor. To confirm that eGFR use may lead to the overdiagnosis of CKD and to examine the utility of eGFR combined with albuminuria for diagnosing stage 3a CKD in the elderly.
Methods
This study included 365 elderly patients (age ≥ 65 years) who were diagnosed with stage 2 or 3a CKD. All patients had 3 years of consecutive data at our hospitals from 2000 to 2012. For each eGFR level, patients were divided into normalbuminuria (NOR, urinary albumin excretion rate [UAER] < 30 mg/24 h), microalbuminuria (30 ≥ UAER < 299 mg/24 h), and macroalbuminuria groups (UAER ≥ 300 mg/24 h).
Results
Albuminuria was associated with eGFR loss but not baseline eGFR level. When stage 2 NOR was used as a reference, the multivariable adjusted odds ratio (OR) for rapid kidney function decline (RKFD) of stage 3a NOR was 1.329 (95 % confidence interval (CI): 0.334–5.281, P = 0.686). ORs for other groups were significantly higher. In stage 3a NOR, higher ORs for RKFD were associated with younger age groups.
Conclusions
Lot of elderly patients with stage 3a CKD and normal albuminuria levels may be over-diagnosed. Albuminuria may be combined with eGFR for improved diagnosis and treatment of stage 3 CKD in the elderly.
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Acknowledgments
This project, “The study on risk appraisal of chronic disease and health warning signs in the elderly, 2007 - 1041” was supported by the Capital Medical Development Scientific Research Fund of China.
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Liu, C., Chen, H., Liu, C. et al. Combined application of eGFR and albuminuria for the precise diagnosis of stage 2 and 3a CKD in the elderly. J Nephrol 27, 289–297 (2014). https://doi.org/10.1007/s40620-013-0011-6
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DOI: https://doi.org/10.1007/s40620-013-0011-6