Which of the following components comprise airway or ventilator circuit pressures? I. pressure generated to overcome airway resistance II. transpulmonary pressure III. pressure caused by dynamic compression IV. pressure from respiratory system compliance
A. I, IV only
B. II, III only
C. I, III, IV only
D. II, III, IV only
?ANS: A
A. Correct response: Airway or ventilator circuit pressures reflect the pressures to overcome airway resistance and respiratory system compliance. When an inspiratory pause is activated, the pressure related to respiratory system compliance is measured. The pressure is the static pressure or the plateau pressure.
B. Incorrect response: Transpulmonary pressure gradient is the pressure difference between alveolar pressure and the plateau (static) pressure.
C. Incorrect response: The pressure is not measured during mechanical ventilation.
D. Incorrect response: See explanation A.
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