Prior to applying a nonrebreathing mask on a patient with difficult breathing you should
A. set the flow rate to no more than 10 L/min.
B. prefill the reservoir bag to ensure delivery of 100% oxygen
C. insert a nasopharyngeal airway to maintain airway patency.
D. perform a complete physical examination to determine the degree of hypoxia.
Answer: B. prefill the reservoir bag to ensure delivery of 100% oxygen
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What is the function of the scalenes in respiration?
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