The aim of this study was to analyse in patients with HIV infection whether there is an association between clinical (time of infection, length of HAART) and analytical parameters (total number and nadir of CD4 cells, zenith viral load-VL) and endothelial dysfunction, measured by FMD, BHI and EPCs, as well as with the presence of subclinical atherosclerosis assessed by the coronary artery calcium score and the determination of IMT. Here, CD4 is linked to endothelial dysfunction.