The volume delivered by a pressure-limited ventilator will decrease under which of the following conditions?
1. The patient's lung or thoracic (chest wall) compliance falls.
2. Airway resistance rises (inspiratory time <3 times the time constant).
3. The patient tenses the respiratory muscles during inspiration.
4. Airway resistance rises (inspiratory time >3 times the time constant).
a. 1 and 3 only
b. 1, 3, and 4 only
c. 3 and 4 only
d. 2, 3, and 4 only
ANS: B
However, if insufficient time is available for pressure equilibration, delivered volume decreases as airway resistance increases.
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