Final answer:
The highest priority interventions for a nurse caring for a client experiencing an anaphylactic reaction are to establish a patent airway, administer epinephrine IVP, and begin an intravenous infusion with 0.9% sodium chloride.
Step-by-step explanation:
The highest priority intervention for a nurse caring for a client experiencing an anaphylactic reaction is to establish a patent airway to ensure the client can breathe. This is followed by administering epinephrine IVP to counteract the drop in blood pressure. After that, the nurse should begin an intravenous infusion with 0.9% sodium chloride to maintain the client's fluid balance.