Raymond K Hsu1, Boyang Chai2, Jason A Roy2, Amanda H Anderson2, Nisha Bansal3, Harold I Feldman2, Alan S Go4, Jiang He5, Edward J Horwitz6, John W Kusek7, James P Lash8, Akinlolu Ojo9, James H Sondheimer10, Raymond R Townsend2, Min Zhan11, Chi-Yuan Hsu12. 1. University of California, San Francisco, San Francisco, CA. Electronic address: raymond.hsu@ucsf.edu. 2. University of Pennsylvania, Philadelphia, PA. 3. University of Washington, Seattle, WA. 4. University of California, San Francisco, San Francisco, CA; Division of Research, Kaiser Permanente Northern California, Oakland, CA; Stanford University, Stanford, CA. 5. Tulane University, New Orleans, LA. 6. Case Western Reserve University, Cleveland, OH. 7. National Institutes of Health, Bethesda, MD. 8. University of Illinois, Chicago, IL. 9. University of Michigan, Ann Arbor, MI. 10. Wayne State University, Detroit, MI. 11. University of Maryland, Baltimore, MD. 12. University of California, San Francisco, San Francisco, CA; Division of Research, Kaiser Permanente Northern California, Oakland, CA.
Abstract
BACKGROUND: It is not clear whether the pattern of kidney function decline in patients with chronic kidney disease (CKD) may relate to outcomes after reaching end-stage renal disease (ESRD). We hypothesize that an abrupt decline in kidney function prior to ESRD predicts early death after initiating maintenance hemodialysis therapy. STUDY DESIGN: Prospective cohort study. SETTING & PARTICIPANTS: The Chronic Renal Insufficiency Cohort (CRIC) Study enrolled men and women with mild to moderate CKD. For this study, we studied 661 individuals who developed chronic kidney failure that required hemodialysis therapy initiation. PREDICTORS: The primary predictor was the presence of an abrupt decline in kidney function prior to ESRD. We incorporated annual estimated glomerular filtration rates (eGFRs) into a mixed-effects model to estimate patient-specific eGFRs at 3 months prior to initiation of hemodialysis therapy. Abrupt decline was defined as having an extrapolated eGFR≥30mL/min/1.73m(2) at that time point. OUTCOMES: All-cause mortality within 1 year after initiating hemodialysis therapy. MEASUREMENTS: Multivariable Cox proportional hazards. RESULTS: Among 661 patients with CKD initiating hemodialysis therapy, 56 (8.5%) had an abrupt predialysis decline in kidney function and 69 died within 1 year after initiating hemodialysis therapy. After adjustment for demographics, cardiovascular disease, diabetes, and cancer, abrupt decline in kidney function was associated with a 3-fold higher risk for death within the first year of ESRD (adjusted HR, 3.09; 95% CI, 1.65-5.76). LIMITATIONS: Relatively small number of outcomes; infrequent (yearly) eGFR determinations; lack of more granular clinical data. CONCLUSIONS: Abrupt decline in kidney function prior to ESRD occurred in a significant minority of incident hemodialysis patients and predicted early death in ESRD.
BACKGROUND: It is not clear whether the pattern of kidney function decline in patients with chronic kidney disease (CKD) may relate to outcomes after reaching end-stage renal disease (ESRD). We hypothesize that an abrupt decline in kidney function prior to ESRD predicts early death after initiating maintenance hemodialysis therapy. STUDY DESIGN: Prospective cohort study. SETTING & PARTICIPANTS: The Chronic Renal Insufficiency Cohort (CRIC) Study enrolled men and women with mild to moderate CKD. For this study, we studied 661 individuals who developed chronic kidney failure that required hemodialysis therapy initiation. PREDICTORS: The primary predictor was the presence of an abrupt decline in kidney function prior to ESRD. We incorporated annual estimated glomerular filtration rates (eGFRs) into a mixed-effects model to estimate patient-specific eGFRs at 3 months prior to initiation of hemodialysis therapy. Abrupt decline was defined as having an extrapolated eGFR≥30mL/min/1.73m(2) at that time point. OUTCOMES: All-cause mortality within 1 year after initiating hemodialysis therapy. MEASUREMENTS: Multivariable Cox proportional hazards. RESULTS: Among 661 patients with CKD initiating hemodialysis therapy, 56 (8.5%) had an abrupt predialysis decline in kidney function and 69 died within 1 year after initiating hemodialysis therapy. After adjustment for demographics, cardiovascular disease, diabetes, and cancer, abrupt decline in kidney function was associated with a 3-fold higher risk for death within the first year of ESRD (adjusted HR, 3.09; 95% CI, 1.65-5.76). LIMITATIONS: Relatively small number of outcomes; infrequent (yearly) eGFR determinations; lack of more granular clinical data. CONCLUSIONS: Abrupt decline in kidney function prior to ESRD occurred in a significant minority of incident hemodialysis patients and predicted early death in ESRD.
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