What is the immediate management for a child presenting with anaphylaxis?

The immediate management for a child presenting with anaphylaxis is to administer epinephrine. Anaphylaxis is a severe, potentially life-threatening allergic reaction that can progress rapidly. Epinephrine is the first-line treatment and works by causing vasoconstriction, which increases blood pressure, dilating airways to improve breathing, and reducing swelling. Prompt administration of epinephrine can reverse the symptoms of anaphylaxis and is crucial in stabilizing the patient.

Other options, such as antihistamines, may help alleviate mild allergic symptoms but do not address the severe physiological reactions associated with anaphylaxis. CPR is only indicated if the child is unresponsive and not breathing, which is a secondary consideration after ensuring airway, breathing, and circulation are addressed through epinephrine. Oral steroids, while beneficial for longer-term management of allergic reactions, do not provide the immediate relief required in an anaphylactic crisis.