What percentage of adverse reactions to contrast occur within the first five minutes?

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Multiple Choice

What percentage of adverse reactions to contrast occur within the first five minutes?

Explanation:
Most adverse reactions to iodinated contrast occur very soon after administration. About 70% of these events happen within the first five minutes, reflecting the rapid onset of immediate hypersensitivity-type reactions and direct mediator release that produce symptoms like flushing, hives, bronchospasm, or low blood pressure within minutes. The remaining reactions occur later, either within minutes to an hour or as delayed reactions that can appear hours to days after exposure. This pattern underlines why vigilant monitoring is essential during and right after contrast administration.

Most adverse reactions to iodinated contrast occur very soon after administration. About 70% of these events happen within the first five minutes, reflecting the rapid onset of immediate hypersensitivity-type reactions and direct mediator release that produce symptoms like flushing, hives, bronchospasm, or low blood pressure within minutes. The remaining reactions occur later, either within minutes to an hour or as delayed reactions that can appear hours to days after exposure. This pattern underlines why vigilant monitoring is essential during and right after contrast administration.

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