Question

which maneuver best reduces auto-peep?
a increase tidal volume
b decrease inspiratory flow
c increase respiratory rate
d prolong expiratory time

Explanation:

Auto-PEEP (intrinsic positive end-expiratory pressure) occurs when air gets trapped in the lungs because expiration is incomplete. To reduce this, more time needs to be allowed for full expiration.

• Option A: Increasing tidal volume adds more air, worsening air trapping.
• Option B: Decreasing inspiratory flow increases inspiratory time, leaving less time for expiration.
• Option C: Increasing respiratory rate shortens the time available for expiration, worsening air trapping.
• Option D: Prolonging expiratory time gives the lungs more time to empty, reducing trapped air and auto-PEEP.

Answer:

D. prolong expiratory time