Therapeutic management of most children with Hirschsprung's disease is primarily

The correct answer is choice B. Epinephrine.

Choice A rationale:

Diphenhydramine. Diphenhydramine is an antihistamine commonly used to relieve allergic symptoms such as itching, rash, and runny nose. While it can be part of the treatment for anaphylactic reactions, it is not the medication of choice for immediate administration in the case of a severe anaphylactic reaction like the one described in the scenario.

Choice B rationale:

Epinephrine. Correct Answer. In cases of severe anaphylactic reactions, epinephrine (adrenaline) is the medication of choice for immediate administration. Epinephrine acts rapidly to reverse life-threatening symptoms, such as airway constriction, low blood pressure, and hives. It works by dilating airways, increasing heart rate, and improving blood pressure.

Choice C rationale:

Dopamine. Dopamine is a medication used to increase blood pressure and cardiac output in certain critical situations. However, it is not the first-line treatment for anaphylactic reactions. Epinephrine's effects on airway and cardiovascular function make it the preferred choice in this context.

Choice D rationale:

Calcium chloride. Calcium chloride is not the appropriate medication for treating anaphylactic reactions. Its main medical uses include treating hypocalcemia (low blood calcium levels) and certain cardiac arrhythmias. It does not address the primary symptoms and physiological changes associated with anaphylaxis.

The correct answer is choice C. Explain in simple terms how it works.

Choice A rationale:

Asking the girl why she wants to know might be appropriate in some contexts, but children are naturally curious and seeking information is a common behavior. Explaining how the blood pressure apparatus works would likely be more beneficial than questioning her motivation.

Choice B rationale:

Determining why she is anxious assumes that the girl is anxious, which might not be the case. Additionally, the question she asked does not necessarily indicate anxiety, but rather a curiosity about the medical equipment.

Choice C rationale:

Explaining in simple terms how the blood pressure apparatus works is the most appropriate nursing action. This approach respects the child's curiosity and provides her with age-appropriate information, fostering a positive and educational interaction.

Choice D rationale:

Telling her that she will see how it works as it is used might not fully satisfy her curiosity or address her immediate question. Children often benefit from clear and concise explanations, especially when it comes to medical equipment.