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New predictive equations improve monitoring of kidney function in patients with diabetes.
Diabetes Care. 2007 Aug; 30(8):1988-94.DC

Abstract

OBJECTIVE

The Cockcroft-Gault and Modification of Diet in Renal Disease (MDRD) equations poorly predict glomerular filtration rate (GFR) decline in diabetic patients. We sought to discover whether new equations based on serum creatinine (the Mayo Clinic Quadratic [MCQ] or reexpressed MDRD equations) or four cystatin C-based equations (glomerular filtration rate estimated via cystatin formula [Cys-eGFR]) were less biased and better predicted GFR changes.

RESEARCH DESIGN AND METHODS

In 124 diabetic patients with a large range of isotopic GFR (iGFR) (56.1 +/- 35.3 ml/min per 1.73 m2 [range 5-164]), we compared the performances of the equations before and after categorization in GFR tertiles. A total of 20 patients had a second determination 2 years later.

RESULTS

The Cockcroft-Gault equation was the least precise. The MDRD equation was the most precise but the most biased according to the Bland-Altman procedure. By contrast with the MDRD and, to a lesser extent, the MCQ, three of the four Cys-eGFRs were not biased. All equations overestimated the low GFRs, whereas only the MDRD and Rule's Cys-eGFR equations underestimated the high GFRs. For the subjects studied twice, iGFR changed by -8.5 +/- 17.9 ml/min per 1.73 m2. GFR changes estimated by the Cockcroft-Gault (-4.5 +/- 6.8) and MDRD (-5.7 +/- 6.2) equations did not correlate with the isotopic changes, whereas new equation-predicted changes did: MCQ: -8.7 +/- 9.4 (r = 0.44, P < 0.05) and all four Cys-eGFRs: -6.2 +/- 7.4 to -7.3 +/- 8.4 (r = 0.60 to 0.62, all P < 0.005), such as 100/cystatin-C (r = 0.61, P < 0.005).

CONCLUSIONS

The new predictive equations better estimate GFR than the Cockcroft-Gault equation. Although the MDRD equation remains the most accurate, it poorly predicts GFR decline, as it overestimates low and underestimates high GFRs. This bias is lesser with the MCQ and Cys-eGFR equations, so they better predict GFR changes.

Authors+Show Affiliations

Biochemistry Laboratory, Hôpital Haut-Lévêque, Pessac, France. marie-christine.beauvieux@chu-bordeaux.frNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17536079

Citation

Beauvieux, Marie-Christine, et al. "New Predictive Equations Improve Monitoring of Kidney Function in Patients With Diabetes." Diabetes Care, vol. 30, no. 8, 2007, pp. 1988-94.
Beauvieux MC, Le Moigne F, Lasseur C, et al. New predictive equations improve monitoring of kidney function in patients with diabetes. Diabetes Care. 2007;30(8):1988-94.
Beauvieux, M. C., Le Moigne, F., Lasseur, C., Raffaitin, C., Perlemoine, C., Barthe, N., Chauveau, P., Combe, C., Gin, H., & Rigalleau, V. (2007). New predictive equations improve monitoring of kidney function in patients with diabetes. Diabetes Care, 30(8), 1988-94.
Beauvieux MC, et al. New Predictive Equations Improve Monitoring of Kidney Function in Patients With Diabetes. Diabetes Care. 2007;30(8):1988-94. PubMed PMID: 17536079.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - New predictive equations improve monitoring of kidney function in patients with diabetes. AU - Beauvieux,Marie-Christine, AU - Le Moigne,Françoise, AU - Lasseur,Catherine, AU - Raffaitin,Christelle, AU - Perlemoine,Caroline, AU - Barthe,Nicole, AU - Chauveau,Philippe, AU - Combe,Christian, AU - Gin,Henri, AU - Rigalleau,Vincent, Y1 - 2007/05/29/ PY - 2007/5/31/pubmed PY - 2007/10/5/medline PY - 2007/5/31/entrez SP - 1988 EP - 94 JF - Diabetes care JO - Diabetes Care VL - 30 IS - 8 N2 - OBJECTIVE: The Cockcroft-Gault and Modification of Diet in Renal Disease (MDRD) equations poorly predict glomerular filtration rate (GFR) decline in diabetic patients. We sought to discover whether new equations based on serum creatinine (the Mayo Clinic Quadratic [MCQ] or reexpressed MDRD equations) or four cystatin C-based equations (glomerular filtration rate estimated via cystatin formula [Cys-eGFR]) were less biased and better predicted GFR changes. RESEARCH DESIGN AND METHODS: In 124 diabetic patients with a large range of isotopic GFR (iGFR) (56.1 +/- 35.3 ml/min per 1.73 m2 [range 5-164]), we compared the performances of the equations before and after categorization in GFR tertiles. A total of 20 patients had a second determination 2 years later. RESULTS: The Cockcroft-Gault equation was the least precise. The MDRD equation was the most precise but the most biased according to the Bland-Altman procedure. By contrast with the MDRD and, to a lesser extent, the MCQ, three of the four Cys-eGFRs were not biased. All equations overestimated the low GFRs, whereas only the MDRD and Rule's Cys-eGFR equations underestimated the high GFRs. For the subjects studied twice, iGFR changed by -8.5 +/- 17.9 ml/min per 1.73 m2. GFR changes estimated by the Cockcroft-Gault (-4.5 +/- 6.8) and MDRD (-5.7 +/- 6.2) equations did not correlate with the isotopic changes, whereas new equation-predicted changes did: MCQ: -8.7 +/- 9.4 (r = 0.44, P < 0.05) and all four Cys-eGFRs: -6.2 +/- 7.4 to -7.3 +/- 8.4 (r = 0.60 to 0.62, all P < 0.005), such as 100/cystatin-C (r = 0.61, P < 0.005). CONCLUSIONS: The new predictive equations better estimate GFR than the Cockcroft-Gault equation. Although the MDRD equation remains the most accurate, it poorly predicts GFR decline, as it overestimates low and underestimates high GFRs. This bias is lesser with the MCQ and Cys-eGFR equations, so they better predict GFR changes. SN - 1935-5548 UR - https://www.unboundmedicine.com/medline/citation/17536079/New_predictive_equations_improve_monitoring_of_kidney_function_in_patients_with_diabetes_ L2 - http://care.diabetesjournals.org/cgi/pmidlookup?view=long&amp;pmid=17536079 DB - PRIME DP - Unbound Medicine ER -