Sodium Bicarbonate in Preventing Contrast Induced Nephropathy

Inclusion Criteria: All adult patients (18 years and above) who are scheduled for cardiac catechization and have abnormal but stable renal function will be eligible for enrollment. Abnormal renal function is defined as a creatinine level exceeding the normal range (more than 115 or 96 um/L in males and females, respectively, in KFSH\&RC laboratories) or eGFR less than 60 ml/min Exclusion Criteria: Patients who fall under any of the following categories will be excluded: * Acute renal failure * Cardiogenic shock * Emergency cardiac catheterization * Preexisting peritoneal or hemodialysis * Pregnancy * Recent exposure to contrast agent within the last 3 days * Allergy to contrast or any of the above treatment * Renal transplant, * Patients who received dopamine, mannitol, theophyllin or other medications known to affect renal function within one week from cardiac cath * Pulmonary edema / congestive heart failure * Use of N-acetylcystein * Patents on NSAIDS who can not stop using them for 48 hrs before and 48 hrs after procedure (except Aspirin).