Contrast nephropathy: review focusing on prevention

Area of Science:

• Nephrology
• Radiology
• Pharmacology

Background:

• Contrast nephropathy (CN) is a major cause of morbidity and mortality, particularly in patients with pre-existing renal insufficiency and diabetic nephropathy.
• Pathogenesis involves medullary hypoxia and direct cytotoxicity.
• CN is defined by a serum creatinine increase of >0.5 mg/dl or 25% within 48 hours of contrast exposure.

Purpose of the Study:

• To review current understanding and management strategies for contrast nephropathy.
• To evaluate the efficacy of various prophylactic interventions.

Main Methods:

• Review of existing literature on contrast nephropathy pathogenesis and prevention.
• Analysis of studies evaluating intravenous hydration, low/iso-osmolality contrast agents, dopamine, fenoldopam, theophylline, N-acetylcysteine (NAC), hemodialysis, and hemofiltration.

Main Results:

• Intravenous hydration and low/iso-osmolality contrast agents are recommended.
• The efficacy of dopamine, fenoldopam, and theophylline is unproven or conflicting.
• High-dose NAC shows potential benefit in specific high-risk groups.
• Prophylactic hemodialysis is ineffective, but hemofiltration demonstrated significant benefit.

Conclusions:

• Current recommendations include IV hydration and specific contrast agents.
• High-dose NAC and prophylactic hemofiltration are promising strategies for preventing contrast nephropathy in at-risk patients.