Objectives of the study are: -to determine plasma levels of high-sensitivity cardiac troponin T (hs sTnT), NT-proBNP and high sensitivity C-reactive protein (hs CRP) and their changes during hemodialysis; and -to link LVH and cardiac biomarkers in patients undergoing hemodialysis without signs of acute coronary syndrome or heart failure. This evidence concerns the gene CRP and acute coronary syndrome.