Contrast-induced nephropathy: pathogenesis and prevention

Area of Science:

• Nephrology
• Cardiology
• Radiology

Background:

• Contrast-induced nephropathy (CIN) is a significant cause of hospital-acquired acute kidney injury, frequently linked to cardiovascular procedures.
• High-risk patient groups include the elderly and those with pre-existing conditions like chronic kidney disease, diabetes, and cardiovascular disease.
• Key risk factors involve contrast agent volume and osmolality, potentially leading to renal medullary ischemia and direct cytotoxic effects via reactive oxygen species.

Purpose of the Study:

• To review the pathogenesis of contrast-induced nephropathy.
• To evaluate the efficacy of various prophylactic strategies for CIN.
• To discuss the current understanding of preventative measures and their limitations.

Main Methods:

• Literature review of studies on contrast-induced nephropathy.
• Analysis of risk factors and pathogenetic mechanisms.
• Evaluation of preventative strategies including hydration, pharmacologic agents, and dialysis.

Main Results:

• Normal saline is generally accepted as a protective measure against CIN.
• The effectiveness of isotonic sodium bicarbonate and N-acetylcysteine in CIN prevention remains inconclusive.
• Dialytic therapies have yielded mixed results and present logistical and economic challenges.

Conclusions:

• Understanding CIN pathogenesis is crucial for developing effective prevention strategies.
• While hydration with normal saline is a standard preventative measure, further research is needed for other agents.
• Current evidence does not strongly support routine use of sodium bicarbonate or N-acetylcysteine for CIN prevention, and dialysis is not a preferred method due to practical limitations.