Which of the following are common causes of tachypnea? 1. Hypoxemia 2. Exercise 3. Narcotic overdose 4. Metabolic acidosis

a. 2, 3, and 4 only
b. 1, 2, and 4 only
c. 2 and 3 only
d. 1 and 4 only

ANS: B
Rapid respiratory rates are associated with exertion, fever, arterial hypoxemia, metabolic acidosis, anxiety, atelectasis, and pain.