Which of the following best describes premedication for iodinated contrast in high-risk patients?

• A. Premedication reduces risk of allergic reaction in high-risk patients undergoing iodinated contrast.
• B. Premedication is unnecessary if hydration is used.
• C. Use high-osmolar contrast to speed imaging.
• D. Increase contrast dose.

Answer: (B)

The main idea here is how to reduce adverse effects of iodinated contrast in people at higher risk. Adequate hydration is a cornerstone protection because it helps preserve kidney perfusion and dilutes contrast in the tubules, lowering the risk of contrast-induced nephropathy. Premedication with steroids or antihistamines is intended to blunt allergic-like reactions to iodinated contrast, but it does not replace the renal-protective effect of hydration. In many high-risk patients, if you can ensure good hydration and use safer contrast agents at appropriate doses, routine premedication may not be necessary. Premedication should be reserved for specific scenarios, such as a history of a serious prior reaction, where the benefit-risk balance justifies additional measures. So hydration addresses the major nonallergic risk and can make premedication unnecessary in general, though you’d still individualize based on the patient’s history and the clinical context.