Which of the following would be considered a severe contrast media reaction?

A severe contrast media reaction is typically characterized by symptoms that indicate a serious threat to the patient's health and may require immediate medical intervention. Seizures fall into this category because they can signify significant neurological distress and can lead to complications such as aspiration or injury. Contrast media reactions, particularly severe ones, can compromise the patient's stability and necessitate prompt treatment to ensure safety.

In contrast, hives, nausea, and headache, while uncomfortable and potentially distressing, are generally categorized as mild to moderate reactions. These symptoms do not indicate an immediate risk to the patient's life and can often be managed with supportive care or medication. Understanding the severity of reactions is crucial for radiologic technologists in order to assess and respond appropriately to patient needs during imaging procedures.