Strategies to prevent contrast nephropathy

Area of Science:

• Nephrology
• Radiology
• Pharmacology

Background:

• Contrast nephropathy (CN) is a frequent cause of iatrogenic acute renal failure, particularly in older patients undergoing procedures with intra-arterial contrast agents.
• The incidence of CN is increasing due to the growing use of diagnostic and interventional procedures involving contrast media.

Purpose of the Study:

• To review the mechanisms and risk factors associated with contrast nephropathy.
• To summarize controlled studies on CN prevention measures.
• To provide evidence-based strategies for preventing contrast nephropathy.

Main Methods:

• Review of existing literature on contrast nephropathy mechanisms, risk factors, and prevention strategies.
• Analysis of controlled studies evaluating different preventive interventions.
• Synthesis of findings to establish evidence-based recommendations.

Main Results:

• Pathophysiological mechanisms include intrarenal vasoconstriction, medullary ischemia, direct cytotoxicity, oxidative stress, and apoptosis.
• Nephrotoxicity is influenced by contrast agent properties (osmolality, dose, route) and patient factors (renal impairment, cardiovascular disease, drug interactions).
• Recommended preventive measures include discontinuing nephrotoxic drugs, hydration (sodium-bicarbonate preferred), limiting contrast volume, using low-osmolal contrast agents, and considering N-acetylcysteine, theophylline, or ascorbic acid.

Conclusions:

• Contrast nephropathy significantly impacts patient morbidity and mortality.
• Key preventive strategies involve optimizing hydration, judicious contrast use, and specific pharmacological interventions tailored to patient risk factors.
• Periprocedural hemofiltration is a proven intervention for patients with severe cardiac and renal insufficiency.
• Further large randomized controlled trials are needed to confirm the clinical benefits of pharmacological interventions for CN.