In an effort to determine a patient's need for ventilatory support, which of the following factors increase(s) ventilatory workload? 1. Decreased lung compliance 2. Decreased thoracic compliance 3. Increased airway resistance 4. Artificial airways

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

ANS: D