GFR at Initiation of Dialysis and Mortality in CKD: A Meta-analysis

Background: The proportion of patients with advanced chronic kidney disease (CKD) initiating dialysis therapy at a higher glomerular filtration rate (GFR) has increased during the past decade. Recent data suggest that higher GFR may be associated with increased mortality. Study Design: A meta-analysis of cohort studies and trials. Setting & Population: Patients with advanced CKD. Selection Criteria for Studies: We performed a systematic literature search in MEDLINE, Cochrane Central Register of Controlled Trials, ClinicalTrials.gov, American Society of Nephrology abstracts, and bibliographies of retrieved articles to identify studies reporting on GFR at dialysis therapy initiation and mortality. Predictor: Estimated or calculated GFR at dialysis therapy initiation. Outcome: Pooled adjusted hazard ratio (HR) of continuous GFR for all-cause mortality. Results: 16 cohort studies and 1 randomized controlled trial were identified (n = 1,081,116). By meta-analysis restricted to 15 cohorts (n = 1,079,917), higher GFR at dialysis therapy initiation was associated with a higher pooled adjusted HR for all-cause mortality (1.04; 95% CI, 1.03-1.05; P