Endothelial dysfunction (ED) is a precursor and cause of cardiovascular diseases. Defining of endothelial thickness and coronary microvascular function could be useful for detecting ED. Endothelial dysfunction could be assessed by coronary flow reserve (CFR), carotid intima media thickness (IMT). Repeating measurement of IMT and CFR could be predictor of cardiovascular events and mortality in peritoneal dialysis patients.