Key result
The modified Cockcroft-Gault equation significantly improved the accuracy of creatinine clearance estimates compared to the conventional equation in older patients.
Why the study?
Does the modified Cockcroft-Gault equation improve the accuracy of creatinine clearance estimates compared to the conventional Cockcroft-Gault equation in older patients?
Observational (n=2,601)
No
Does the modified Cockcroft-Gault equation improve the accuracy of creatinine clearance estimates compared to the conventional Cockcroft-Gault equation in older patients?
Absolute Event Rate: 24.45% vs 29.9%
p-value: p=<0.01
A modified Cockcroft-Gault equation and a novel multivariate linear regression equation incorporating body composition improve renal function estimation in older adults, especially those with low albumin.
May improve renal dosing precision in older adults; leaves open need for prospective outcome validation.
The modified Cockcroft-Gault (CG) equation, previously developed for an aged-oriented cohort, was validated in a newly obtained dataset. Estimates of creatinine clearance (CCr) using this equation were found to be more accurate than those determined using the conventional CG equation, particularly for patients exceeding 65 years of age. We identified a subset of patients in this cohort whose estimates were inadequate. Using statistical analysis, we found that the deviation from estimates was attributed to a decreased albumin level. In addition, we determined a reduced albumin cutoff value for the modified CG equation to obtain a good estimate. Univariate linear regression analysis was applied to measure the CCr in this cohort and identify parameters related to body composition, and we found that extracellular water (ECW)/total body water (TBW) and body fat (%) were relevant. Using measured values of ECW/TBW and body fat (%), a multivariate linear regression (MLR) estimating equation was developed based on the modified CG equation. This equation was applied to a cohort over 65 years of age, and it was found that a good estimate was obtained for older patients with low albumin levels. Thus, we propose a flow diagram that illustrates conditions for selecting an appropriate estimating equation from among the CG, modified CG, and MLR equations.
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Kaburaki et al. (2023) conducted an observational in Renal function estimation (n=2,601). Modified Cockcroft-Gault equation vs. Conventional Cockcroft-Gault equation was evaluated on Mean absolute prediction error (MAE%) of estimated creatinine clearance in patients aged 65-74 years (Generation III) (p=<0.01). The modified Cockcroft-Gault equation significantly improved the accuracy of creatinine clearance estimates compared to the conventional equation in older patients.
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