How many lobes do normal human lungs have?

You have arrived on the scene at a high school football field where a 17-year-old male is lying on the ground. He is unresponsive and cyanotic, and he is making obvious respiratory effort without moving adequate amounts of air. Which of the following should be done first?

A) Assist ventilations with a bag-valve-mask device and supplemental oxygen. B) Open the patient's airway using a manual maneuver. C) Insert a nasopharyngeal or oropharyngeal airway. D) Apply high-concentration oxygen by nonrebreather mask.

You are awaiting removal of a patient from a trench in which he is buried in dirt up to his nipple line . Which of the following is the greatest risk for this patient?

A) Compartment syndrome B) Asphyxiation C) Crush syndrome D) Long bone fractures