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. apply high-concentration oxygen by nonrebreather mask. b. insert a nasopharyngeal or oropharyngeal airway. c. assist ventilations with a bag-valve-mask device and supplemental oxygen. d. open the patient's airway using a manual maneuver.

D. Open the patient's airway using a manual maneuver.

when in a crucial situation, after calling 911, the correct posture for delivering effective compression is the proper hand placement.

first, place two fingers at the sternum, then put the heel of your other hand next to the fingers and place hand on top of the other. lock your elbows by using your body’s weight and compress the victim’s chest with a depth of 2 inches.

moreover, do 15 compression and 2 breaths, this process must be done four times until there is a pulse or a arrive.