A flowing sprinkler head can displace oxygen within a(n) ____-foot area surrounding the head.

During auscultation of a patient's chest, you hear coarse crackles throughout both inspiration and expiration. These sounds clear when the patient coughs. Which of the following is the most likely cause of these adventitious sounds?

a. Opening of closed smaller airways or al-veoli b. Opening of collapsed large, proximal air-ways c. Variable obstruction to flow in the upper airway d. Movement of excessive secretions in the airways

Which of the following are true of early inspiratory crackles?

1. They most often occur in COPD patients. 2. They generally indicate severe airway obstruction. 3. They are affected by coughing or positional change. 4. They are usually scant (few in number). a. 2 and 4 only b. 1, 2, and 3 only c. 3 and 4 only d. 1, 2, and 4 only