As the effect of statin use before the angiography to prevent contrast induced nephropathy (CIN) is not well-known, the aim of the current study is to assess the effect of atorvastatin on prevention of CIN in patients undergoing coronary angiography.

Inclusion Criteria:

• having chronic stable angina who were referred for coronary angiography
• non-pregnant female subjects
• no history of diabetes mellitus
• no history of renal failure
• no history of single kidney
• no history of cardiogenic shock
• no history of unstable angina
• no history of myocardial infarction
• no history of hypersensitivity to statins
• no history of previous intravascular contrast injection during one month before admission

Exclusion Criteria:

• glomerular filtration rate (GFR) <60
• cardiogenic shock