Which maneuver will maintain air in the lungs at the end of inspiration, before the exhalation valve opens?
a. Pressure limit
b. Inspiratory hold
c. Expiratory hold
d. Expiratory resistance
ANS: B
The inspiratory hold, inspiratory pause, or end-inspiratory pause is the maneuver that will main-tain air in the lungs and extend inspiration. Pressure limit allows pressure to rise but not exceed a pressure limit setting. Expiratory hold is the maneuver that will obtain the unintended positive end expiratory pressure (auto-PEEP) measurement. The ventilator pauses before delivering the next machine breath. Expiratory resistance is a resistance added to exhalation to mimic pursed-lip breathing.
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