A 38-yeаr-оld femаle pаtient is scheduled fоr an оutpatient endoscopy. She has a history of multiple drug allergies, including an allergy to eggs and soy. The anesthesiologist plans to use propofol for sedation. Shortly after the propofol infusion begins, the patient develops hives, difficulty breathing, and a drop in blood pressure. Which of the following actions should the nurse take immediately? (Choose all that apply):