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  • Title: Does stage III chronic kidney disease always progress to end-stage renal disease? A ten-year follow-up study.
    Author: Baek SD, Baek CH, Kim JS, Kim SM, Kim JH, Kim SB.
    Journal: Scand J Urol Nephrol; 2012 Jun; 46(3):232-8. PubMed ID: 22545920.
    Abstract:
    OBJECTIVE: Clinically, it may be appropriate to subdivide patients with stage 3 chronic kidney disease (CKD) into two subgroups, as they show different risks for kidney outcomes. This study evaluated the proportion of patients with stage 3 CKD who progressed to stage 4 or 5 CKD over 10 years and independent predictors of progression of renal dysfunction. It sought to validate whether stage 3 CKD patients should be subdivided. MATERIAL AND METHODS: This retrospective cohort study enrolled 347 stage 3 CKD patients between January 1997 and December 1999, who were followed up through June 2010. The baseline clinical characteristics and outcomes were compared in patients with stage 3A [45 <estimated glomerular filtration rate (eGFR) <60 ml/min/1.73 m(2)] and stage 3B (30 < eGFR <45 ml/min/1.73 m(2)) CKD. RESULTS: Of the 347 patients, 196 (58.2%) were in stage 3A. The only difference in baseline characteristics between stages 3A and 3B patients was the degree of albuminuria. During follow-up, 167 patients (48.1%) did not progress, 60 (17.3%) progressed to stage 4 and 120 (34.6%) progressed to stage 5, with 91 (26.2%) starting dialysis. Multivariate Cox regression analysis showed that macroalbuminuria [(hazard ratio (HR) 3.06, 95% confidence interval (CI) 1.48-2.89, p < 0.001], microalbuminuria (HR 1.99 95% CI 1.04-3.85, p = 0.038), microscopic haematuria (HR 2.07 95% CI 1.48-2.89, p < 0.001) and stage 3B CKD (HR 2.99 95% CI 2.19-4.10, p < 0.001) were independent predictors of progression of renal dysfunction. Stage 3B patients had higher risks of adverse renal and cardiovascular outcomes than stage 3A patients. CONCLUSIONS: About half of the patients with stage 3 CKD progressed to stage 4 or 5, as assessed by eGFR, over 10 years. Degree of albuminuria, stage 3 subgroup and microscopic haematuria were important risk factors for progression of stage 3 CKD. It would be appropriate to divide the present stage 3 CKD into two subgroups.
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