Effect of Sodium Bicarbonate Solution in Decreasing the Incidence of Contrast Induced Nephropathy (CIN)

Radio Contrast Induced Nephropathy (RCIN) remains a well recognized complication in patients undergoing diagnostic or interventional procedures requiring radiographic contrast agents and is the third leading cause of acquired acute renal failure in hospitalized patients. Strategies for the prevention of radiocontrast nephropathy have focused on countering vasoconstriction (pre-hydration, fenoldopam, and theophylline), enhancing flow through the nephron (diuretics), or protection against oxygen-free-radical injury (urinary alkalinization and N-acetylcysteine).

Among all prophylactic measures that have been proposed, adequate preprocedural and postprocedural hydration has demonstrated effectiveness in the prevention of radiocontrast nephropathy. Thus, it remains the most frequently applied measure in clinical practice.

A Recent study in May 2004 have shown benefit in administering Sodium Bicarbonate over normal saline as a prophylaxy.Since alkalizing renal tubular fluid with bicarbonate may reduce injury.

Comparisons: IV 154 mEq/L solution of NaCl 0.9% OR IV 154 mEq/ L sodium bicarbonate solved in 154 mEq/ L NaCl 0.9%. Each fluid is infused at the rate of 3 ml/kg/ hour one hour before the angiographic procedure, continuing at the rate of 1 ml/kg/ hour for 6 hours after the procedure. Maximum rate of fluid permitted is that for a body weight of 110 Kg.

Inclusion criteria

• individuals aged 18 years or older with stable serum creatinine levels of at least 1.5 mg/dl , who were scheduled to undergo diagnostic or therapeutic coronary artery angiography during the next 24 hours of hospitalization and were available until 5 days after the procedure for serum creatinine measurements.

Exclusion criteria

• serum creatinine levels of more than 8 mg/dl
• previous history of dialysis
• eGFR < 20
• emergency catheterization
• recent exposure to radiographic contrast agents (within previous two days of the study)
• radiocontrast agent dosage needed more than 300 cc during the procedure
• allergy to radiocontrast agent
• pregnancy
• administration of dopamine, mannitol , fenoldopam or N-Acetyl Cystein during the intended time of study
• need for continuous hydration therapy (e.g. sepsis )
• history of Multiple myeloma , Pulmonary edema , Uncontrolled hypertension (treated systolic blood pressure more than 160 mmHg, or diastolic blood pressure more than 100mmHg.) ,Severe heart failure (EF < 30% or NYHA 3-4).