ARRT Patient Care Practice Exam

A patient developed hives several minutes after injection of an iodinated contrast agent. What type of drug should be readily available?

1. analgesic

2. antihistamine

3. anti-inflammatory

4. antibiotic

The correct answer is: antihistamine

The development of hives, also known as urticaria, shortly after the injection of an iodinated contrast agent indicates an allergic reaction. In cases of allergic reactions, particularly those that involve skin manifestations like hives, antihistamines are the most appropriate medication to have readily available. Antihistamines work by blocking histamine, a substance in the body that is released during an allergic reaction and is responsible for causing symptoms such as hives, itching, and swelling. Having an antihistamine on hand allows for prompt management of these allergic reactions, reducing patient discomfort and preventing escalation to more severe symptoms. Analgesics are generally used for pain management and would not address the specifics of an allergic reaction. Anti-inflammatory medications might be utilized in some cases of severe allergic reactions but are not the first-line treatment for hives following contrast administration. Antibiotics are used to treat bacterial infections and would not be relevant in this scenario, as hives are not caused by bacterial pathogens. Thus, having antihistamines available is crucial in managing immediate allergic reactions after contrast agent administration.