Primary end point of the study was the incidence of CIN: The median peak increase in serum creatinine concentration between day 0 (when contrast was administered) and day 7. Definition of CIN was an absolute increase in serum creatinine (SCr) >0.5 mg/dl or a relative increase >25% compared to baseline SCr. Definition of non-Q-wave myocardial infarction was a creatine kinase-myocardial band enzyme elevation 3 times the upper normal value without new Q waves on the electrocardiogram. Definition of Q-wave myocardial infarction was presence of new pathologic Q waves on an electrocardiogram in conjunction with an elevation in creatine kinase greater than 3 times the normal value. All adverse clinical events as well as study end points were monitored and adjudicated by the independent event committee. Each patient was contacted in every week after administration of the contrast, investigated if dialysis or main cardiovascular events (myocardial infarction,acute heart failure and death), and record any adverse events.