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Mortality, malnutrition, and atherosclerosis in ESRD: What is the role of interleukin-6? There is growing evidence that increased plasma concentrations of CRP strongly predict cardiovascular death in both non-renal and renal patient populations. The interleukin-6 (IL-6) system activity, which is the major mediator of the acute phase response, is often markedly up-regulated in uremic patients and has also been shown to predict outcome. This raises the issue of whether or not IL-6 per se may contribute to increased mortality from malnutrition and atherosclerotic cardiovascular disease in uremic patients. The causes of elevated IL-6 levels in the uremic circulation are not fully understood, although a number of factors prevalent in uremic patients, such as hypertension, adiposity, infections, and chronic heart failure may all contribute. However, factors associated with the dialysis procedure, such as bioincompatibility and …