Key of this prospective study is to identify a potentially increased cardiovascular risk in patients with systemic Lupus erythematodes, with and without renal affection. Three group of patients will be compared as followed. First group are patients with known systemic Lupus erythematodes without renal affection, second group are patients with known systemic Lupus erythematodes with renal affection and the third group are patients with a non-autoimmun chronic kidney disease