While a sedated and paralyzed patient receives VC-CMV, which of the following pressures reflect chest wall compliance?
A. airway pressure
B. esophageal pressure
C. mean airway pressure
D. peak inspiratory pressure
?ANS: B
A. Incorrect response: Airway pressure is the pressure at the airway opening.
B. Correct response: A pressure transducer inserted into the midesophagus measures the pressure inside the esophagus throughout the ventilatory cycle. Because of the proximity of the esophagus to the pleural space, esophageal pressure measured in this manner reflects pressure changes in the pleural space, and changes in the compliance of the chest wall.
C. Incorrect response: The mean airway pressure is the average pressure exerted at the airway opening throughout the entire ventilatory cycle. It is mathematically equivalent to the pressure within the area under a pressure-time scalar throughout the respiratory cycle.
D. Incorrect response: Peak inspiratory pressure is the highest pressure achieved during inspiration delivered by a positive pressure ventilator.
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