alexa Relationship of Race and Proteinuria to Renal Function Decline in Patients with CKD | OMICS International | Abstract
ISSN: 2161-0959

Journal of Nephrology & Therapeutics
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Research Article

Relationship of Race and Proteinuria to Renal Function Decline in Patients with CKD

Steven Rosansky1*, Martin Durkin2, James Hardin3, Kirby Jackson3, Csaba Kovesdy4, Jessica Sontrop5, Justin Reynolds1, Kathlyn Haddock1, Frankie Richards1 and William Clark5

1WJBDVA Hospital, Dorn Research Institute, University of South Carolina School of Public Health, Columbia, SC, USA

2Palmetto Health Hospital, Research Service, Columbia, SC, USA

3University of South Carolina School of Public Health, Columbia, SC, USA

4Memphis VA Medical Center, Nephrology, Memphis, TN, India

5Division of Nephrology London Health Sciences Centre London, Ontario, UK

*Corresponding Author:
Steven Rosansky
WJBD VA Hospital, Dorn Research Institute
University of South Carolina School of Public Health
Columbia, SC, USA, 526 N Trenholm Rd
Columbia SC 29206, USA
Tel: 8034225427
E-mail: [email protected]

Received Date: March 31, 2014; Accepted Date: May 10, 2014; Published Date: May 17, 2014

Citation: Rosansky S, Durkin M, Hardin J, Jackson K, Kovesdy C, et al. (2014) Relationship of Race and Proteinuria to Renal Function Decline in Patients with CKD. J Nephrol Ther 4:168. doi:10.4172/2161-0959.1000168

Copyright: © 2014 Rosansky S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Background: To date, the reasons for the higher rates of treated end-stage renal failure in blacks versus whites are poorly understood. Proteinuria is the most important determinant of renal function loss (RFL). Blacks have a higher incidence of proteinuric CKD than whites. The current study evaluates the hypothesis that after adjustment for proteinuria, blacks have faster RFL, more prominent at lower levels of estimated glomerular filtration rates (eGFR). Methods: In a non-referral outpatient CKD population of 1,935 blacks and 6,286 whites, the relationship of zero, <2 plus and ≥ 2 plus dipstick proteinuria to MDRD e GFR change per year (RFL) was analyzed. Next the relationship between race and RFL was examined in patients with higher versus lower eGFR (defined by never or ever having an eGFR <30 ml/min/1.73 m2, respectively during the study using a mixed effects model which includes longitudinal urinalysis (log converted), serum creatinine data points, age and whether a patient died during the study. Results: Versus whites, blacks had higher baseline e GFR (75.3 ml/min/1.73 m2 versus 64.9 ml/min/1.73 m2) higher frequency of e GFR <30 ml/min/1.73 m2 (30.8% versus 21%), higher dipstick proteinuria levels and faster RFL by proteinuria group (range -1.07 to -2.28 ml/min/m2/year in blacks and -0.68 to -1.80 ml/min/1.73 m2/ year, in whites), p< 0.01. In the mixed effects model, blacks had a 0.30 and 0.59 ml/min/1.73 m2/ year, faster loss of renal function in the higher and lower eGFR groups, respectively, p< 0.001. Conclusion: Blacks with CKD appear to lose renal function faster than whites. This effect may be more pronounced at lower e GFR levels.

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