Abstract
Cystatin C is an established biomarker for renal function, and, given the close association of chronic kidney disease and cardiovascular disease might indicate new-onset or deteriorating cardiovascular disease. However, evidence for cystatin C as a predictor of cardiovascular events is limited and controversial. We therefore aimed at investigating the role of cystatin C as a predictor of future cardiovascular events in a high risk-cohort of patients with established coronary artery disease (CAD). We prospectively recorded cardiovascular events in 1053 patients with angiographically verified CAD over a mean follow-up of 9.5±5.3 years. At baseline, 352 patients had type 2 diabetes mellitus (T2DM) and 701 did not have T2DM. During follow-up, 560 (53.2%) of our patients suffered cardiovascular events. Cystatin C proved to be a strong and independent predictor for cardiovascular events in the total study cohort (standardized adjusted HR 1.22 [1.12-1.33], p<0.001). When T2DM status was taken into account, cystatin C significantly predicted cardiovascular events both in patients with T2DM (HR 1.18 [1.04-1.35], p=0.011) and in non-diabetic patients (HR 1.23 [1.09-1.38], p<0.001). We conclude that cystatin C predicts cardiovascular events in CAD patients both among those with and among those without T2DM.
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