A nurse on the scene following a mass casualty explosion is triaging a client who has a large, open occipital wound and the following findings: respiratory rate 6/min, agonal pattern, capillary refill time 4.5 sec, nonresponsive to painful stimuli. Which of the following actions should the nurse take?
A) Apply direct pressure to the wound
B) Administer high-flow oxygen via non-rebreather mask
C) Perform chest compressions
D) Elevate the client's legs above heart level