What is the correct approach to minimize the risk of contrast-induced nephropathy during vascular imaging?

• A. Use the highest possible volume of contrast to ensure visibility.
• B. Rely on older contrast agents regardless of patient risk.
• C. Hydrate adequately and use iso- or low-osmolar contrast at the lowest necessary volume.
• D. Avoid hydration entirely.

Answer: (C)

Minimizing contrast-induced nephropathy hinges on protecting kidney perfusion and limiting the nephrotoxic load from contrast. Adequate hydration helps maintain renal blood flow and promotes clearance of contrast, reducing the chance of kidney injury. Using iso-osmolar or low-osmolar contrast agents is less harsh on the kidneys than high-osmolar options, especially for patients with risk factors. Also, giving the smallest amount of contrast that still achieves good imaging minimizes exposure to the kidneys.

These combine to lower CIN risk. In contrast, using a large volume increases exposure and risk; older contrast agents may be more nephrotoxic; and skipping hydration removes a key protective factor.