Abstract
Objectives
The aim of the study was to compare the accuracy of three formulae that estimate creatinine clearance (CLCR), in elderly hospitalized patients: the Cockcroft–Gault (CG) formula and the Modification of Diet in Renal Disease formulae with 4 and 6 variables (MDRD4 and MDRD6).
Methods
A prospective, cross-sectional, observational study was conducted in four hospital geriatric wards. Consecutive patients admitted to the wards who were aged ≥75 years and had an indwelling urinary catheter for the purpose of care were eligible for enrolment. CLCR was determined via four methods: measurement of CLCR from plasma and urine creatinine plus 24-h urine volume; the CG formula; and the MDRD4 and MDRD6 formulae. Moderate and severe renal impairments were defined as a CLCR of 30.0–59.9 and <30.0 mL/min, respectively.
Results
A total of 157 patients were included. Their mean age (±SD) was 86.5 ± 6.1 (range 75–105) years and 46.5 % were male. The median values and interquartile ranges (IQRs) (in mL/min) were 44.0 (IQR 32.1–64.5) for measured CLCR, 42.1 (IQR 31.3–56.3) for CG-estimated CLCR, 64.3 (IQR 49.8–81.7) for MDRD4-estimated CLCR and 49.3 (IQR 37.4–63.4) for MDRD6-estimated CLCR (respectively, p < 0.05, p < 0.001 and p = 0.44 compared with measured CLCR). Biases (±SD) for CG, MDRD4 and MDRD6 CLCR estimates were −3.6 (±22.2), 19.3 (±26.4) and 2.4 (±22.5) mL/min, respectively. When estimated CLCR values were assessed against the measured value, it was found that misclassification of renal impairment (absent/moderate/severe) occurred in 41 % of patients when using the CG, in 40 % when using the MDRD6, and in 45 % when using the MDRD4. The 30 % accuracies of the three formulae were 63 % for CG, 37 % for MDRD4 and 59 % for MDRD6.
Conclusion
In elderly hospitalized patients, CG and MDRD6 gave better predictions for measured CLCR than MDRD4, with no significant difference between them.
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No sources of funding were used to assist in the preparation of this study. The authors have no conflicts of interest that are directly relevant to the content of this study.
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Chauvelier, S., Péquignot, R., Amzal, A. et al. Comparison between the Three Most Popular Formulae to Estimate Renal Function, in Subjects 75 Years of Age or Older. Drugs Aging 29, 885–890 (2012). https://doi.org/10.1007/s40266-012-0027-y
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DOI: https://doi.org/10.1007/s40266-012-0027-y