Association between GFR estimated by multiple methods at dialysis commencement and patient survival

Muh Geot Wong, Carol Pollock, Bruce Cooper, Pauline Branley, John Collins, Jonathan Craig, Joan Kesselhut, Grant Luxton, Andrew Pilmore, David Harris, David Johnson

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6 Citations (Scopus)

Abstract

Background and objectives The Initiating Dialysis Early and Late study showed that planned early or late initiation of dialysis, based on the Cockcroft and Gault estimation of GFR, was associated with identical clinical outcomes. This study examined the association of all-cause mortality with estimated GFR at dialysis commencement, which was determined using multiple formulas. Design, setting, participants, & measurements Initiating Dialysis Early and Late trial participants were stratified into tertiles according to the estimated GFR measured by Cockcroft and Gault, Modification of Diet in Renal Disease, or Chronic Kidney Disease-Epidemiology Collaboration formula at dialysis commencement. Patient survival was determined using multivariable Cox proportional hazards model regression. Results Only Initiating Dialysis Early and Late trial participants who commenced on dialysis were included in this study (n=768). A total of 275 patients died during the study. After adjustment for age, sex, racial origin, body mass index, diabetes, and cardiovascular disease, no significant differences in survival were observed between estimated GFR tertiles determined by Cockcroft and Gault (lowest tertile adjusted hazard ratio, 1.11; 95% confidence interval, 0.82 to 1.49; middle tertile hazard ratio, 1.29; 95% confidence interval, 0.96 to 1.74; highest tertile reference), Modification of Diet in Renal Disease (lowest tertile hazard ratio, 0.88; 95% confidence interval, 0.63 to 1.24; middle tertile hazard ratio, 1.20; 95% confidence interval, 0.90 to 1.61; highest tertile reference), and Chronic Kidney Disease-Epidemiology Collaboration equations (lowest tertile hazard ratio, 0.93; 95% confidence interval, 0.67 to 1.27; middle tertile hazard ratio, 1.15; 95% confidence interval, 0.86 to 1.54; highest tertile reference). Conclusion Estimated GFR at dialysis commencement was not significantly associated with patient survival, regardless of the formula used. However, a clinically important association cannot be excluded, because observed confidence intervals were wide.

Original languageEnglish
Pages (from-to)135-142
Number of pages8
JournalClinical Journal of the American Society of Nephrology
Volume9
Issue number1
DOIs
Publication statusPublished - 7 Jan 2014

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    Wong, M. G., Pollock, C., Cooper, B., Branley, P., Collins, J., Craig, J., Kesselhut, J., Luxton, G., Pilmore, A., Harris, D., & Johnson, D. (2014). Association between GFR estimated by multiple methods at dialysis commencement and patient survival. Clinical Journal of the American Society of Nephrology, 9(1), 135-142. https://doi.org/10.2215/CJN.02310213