A preschooler presents to the emergency department with a history of vomiting, diarrhea, and fever over the past few days. She is receiving 100% oxygen via nonrebreather mask. Vital signs are temperature 104.5 degrees Fahrenheit, pulse 144 bpm, respiratory rate 22 breaths per minute, and BP 70/50 mmHg. She is listless and difficult to arouse and has weak peripheral pulses and prolonged capillary refill. What nursing intervention by nurse Julisa takes priority?
Select one of the following: