Which of the following changes in respiratory mechanics occurs when a patient switches from positive-pressure breathing to spontaneous ventilation?
A. increased pulmonary compliance
B. decreased mean pleural pressure
C. decreased respiratory muscle effort
D. decreased diaphragmatic involvement
?ANS: B
A. Incorrect response: Pulmonary compliance will not be affected by the transition from positive-pressure breathing to spontaneous breathing.
B. Correct response: The mean pleural pressure will decrease when a patient is switched from positive-pressure breathing to spontaneous ventilation.
C. Incorrect response: Respiratory muscle effort increases when a patient assumes a greater work of breathing as occurs when a person changes from positive-pressure breathing to spontaneous breathing.
D. Incorrect response: When a patient assumes an increased work of breathing such as transforming from positive-pressure breathing to spontaneous ventilation, the diaphragm increases contraction to support spontaneous breathing.
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