Effects of N-acetyl Cysteine During Primary Percutaneous Coronary Intervention

Inclusion Criteria: * Patients with Acute ST Elevation Myocardial Infarction undergoing Primary Percutaneous Coronary intervention Who Have Moderate to High Risk For Contrast Induced Nephropathy (Mehran Score ≥5) Exclusion Criteria: * Patients \>18 years old with moderate to high risk for contrast induced nephropathy undergoing percutaneous coronary intervention * Low risk for contrast induced nephropathy (Mehran Score \<5) * Use of nephrotoxic agents (NSAIDs, aminoglycosides,recent contrast injection...) * Infection * Pregnancy, Lactation * Renal failure requiring dialysis * Hepatic failure * Allergy to NAC * History of Asthma * Chronic nitrate usage * Malignancy * Use of corticosteroids * Leucocytosis,Thrombocytosis,Anemia * Blood pressure of \>180/100mmHg despite anti-hypertensive therapy