Objective-Previous examinations of depression as a predictor of mortality in end-stage renal disease have yielded inconsistent findings. We sought to clarify the possible link with mortality by assessing depression at an earlier stage of renal impairment before the uremic disease state and depressive symptoms become highly confounded, and then following patients during the period of disease progression.Design-Prospective design using an assessment of depression prior to initiation of renal replacement therapy to predict mortality status an average of 81 months later in patients in the early stages of chronic kidney disease.
Main Outcome Measures-Mortality status.Results-After controlling for relevant mortality risk factors (i.e., age, gender, presence of diabetes and cardiovascular disease, and potassium level), results of Cox regression analyses indicated that higher levels of nonsomatic depression symptoms were predictive of an increased mortality risk, χ 2 (1, N=359) = 8.02, p = .005. Patients with nonsomatic depression scores one standard deviation above the mean had an estimated mortality rate 21.4% higher than average scorers in this sample.Conclusion-Clinical implications of these findings point to the importance of assessment and treatment of depressive symptoms in patients with chronic kidney disease.
Keywords chronic kidney disease; depression; mortalityChronic kidney disease (CKD) affects approximately 31 million people in the United States, at varying stages of severity (U. S. Renal Data System, 2008). CKD is associated with significant morbidity and mortality and, in many cases, eventually progresses to "end-stage"Publisher's Disclaimer: The following manuscript is the final accepted manuscript. It has not been subjected to the final copyediting, fact-checking, and proofreading required for formal publication. It is not the definitive, publisher-authenticated version. The American Psychological Association and its Council of Editors disclaim any responsibility or liabilities for errors or omissions of this manuscript version, any version derived from this manuscript by NIH, or other third parties. The published version is available at www.apa.org/ pubs/journals/HEA NIH Public Access renal failure requiring renal replacement intervention (i.e., renal dialysis or transplantation) to sustain life. Given that CKD typically develops as a complication secondary to diabetes or hypertension, poor control of blood glucose and blood pressure are significant predictors of morbidity in this population and often accelerate the progression of renal failure to end-stage disease (National Kidney Foundation, 2002). Cardiovascular events are also highly correlated with mortality in CKD (Anderson et al., 2009;U.S. Renal Data System, 2008). In addition, nutritional factors, as measured by low levels of serum albumin (Menon et al., 2005), increases in serum phosphate (Kestenbaum et al., 2004), and potassium levels (National Kidney Foundation, 2002), have been found to predict higher risk of all-cause mortality i...