Supplementary Material for: What are the Risk Factors for One-Year Mortality in Older Patients with Chronic Kidney Disease? An Analysis of the Cleveland Clinic CKD Registry

Background: Prognostic factors after dialysis initiation among older chronic kidney disease (CKD) patients are not well studied. In this study, we examined the risk factors associated with 1-year mortality after dialysis initiation among older CKD patients. Methods: In this retrospective study, we included 621 CKD patients from an electronic medical record based CKD registry that was linked to the United States Renal Data System data. In terms of age, they were all ≥65. We examined the associations of various demographic factors, comorbid conditions, relevant laboratory parameters, the presence of arteriovenous fistula, and inability to take care of oneself with 1-year mortality after dialysis initiation using Cox proportional hazards model. Results: In our study cohort, 224 older patients died during the first year of dialysis initiation and the estimated survival at 1 year was 65% (95% CI 62–69). After adjusting for covariates, increasing age by each year (Hazard ratio 1.04 [95% CI 1.02–1.06]), congestive heart failure (CHF; 1.57 [1.13–2.18]), an absence of AVF (3.0 [1.7–5.1]) and lack of nephrology care prior to dialysis initiation (1.93 [1.39–2.70]) were associated with increased risk of 1-year mortality. Nearly 60% of deaths were due to non-cardiovascular (CV) causes including cancer. Conclusion: Risk factors portending high 1-year mortality in older CKD patients are increasing age, CHF, an absence of AVF, and lack of pre-dialysis nephrology care. Clinicians need to be aware of non-CV risks of high mortality in these patients.