Results: CIN occured in female than male gender (5.2% vs 2.2%), no found the association between gender, age >75, hypotension, diabetes mellitus, anemia, high contrast amount and CIN, heart failure ≥ NYHA III or EF <40% (p =0.001; OR =6.5; 95% CI: 2.05 - 20.66), baseline serum creatinin >1.5 mg% (p <0.0001, OR =9.08, 95% CI: 3, 14 - 26.26), baseline eGFR <40 ml / phút/1.73 m2 (p =0.0031, OR =4.31, 95% CI: 1.56 - 11.9) were risk factors of CIN.