QJM Advance Access originally published online on June 5, 2007
QJM 2007 100(7):441-449; doi:10.1093/qjmed/hcm043
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Glomerular filtration rate estimation and mortality in an elderly population
From the Departments of 1Rehabilitation and Geriatric Medicine and 2Medicine, Hadassah University Hospital, Jerusalem, Israel
Address correspondence to Dr Y. Maaravi, Department of Rehabilitation and Geriatric Medicine, Hadassah University Hospital, Mount Scopus, PO Box 24035, Jerusalem 91240, Israel. email: maaravi{at}md2.huji.ac.il
Received 20 October 2006 and in revised form 18 March 2007
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Abstract |
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Background: Few studies have addressed the link between minor renal dysfunction and mortality in the elderly.
Aim: To compare three equations for estimated GFR (eGFR) in assessing renal dysfunction and predicting mortality in an elderly population.
Design: Longitudinal observational study.
Methods: We studied 441 people from the Jerusalem Seventy Year Olds Longitudinal Study who had measurements of serum creatinine, all of whom were aged 70 years at study initiation and were living in the community. GFR was estimated based on serum creatinine and using the Cockcroft-Gault (CG), the abbreviated Modification of Diet in Renal Disease (MDRD) and the Mayo Clinic equations. Twelve-year mortality was the main outcome measure.
Results: The prevalence of reduced eGFR was 51% using the CG, 34% using MDRD and 16% using the Mayo Clinic equation. eGFR dichotomized by the definition of CKD significantly predicted mortality only with the Mayo Clinic equation (hazard ratio 1.56, 95%CI 1.01–2.39). When eGFR was divided into quartiles and the lowest compared to the highest, all equations predicted mortality. Hazard ratios (95%CI) were 5.48 (1.27–23.65), 7.47 (2.74–20.3), and 7.375 (3.13–17.36), for CG, MDRD, and Mayo Clinic, respectively.
Discussion: Reduced eGFR was prevalent in this study group, and associated with mortality. This association was strongest using the Mayo Clinic equation.
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