In which of the following types of ventilation can pleural pressure become positive during inspi-ration? 1. Positive-pressure ventilation 2. Spontaneous ventilation 3. Negative-pressure ventilation
a. 2 and 3 only
b. 1 and 2 only
c. 1, 2, and 3
d. 1 only
ANS: D
Because alveolar pressure is greater than pleural pressure (Ppl) during PPV, positive pressure is transmitted from the alveoli to the pleural space, causing pleural pressure to increase during in-spiration.
Health Professions
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