Auto-PEEP: Time-flow graphic

Shown on the upper graphic is time versus flow for an individual mechanically ventilated patient. Expiratory flow should normally reach zero before the onset of inspiration. However, when auto-PEEP is present, expiratory flow does not reach zero before inspiration. The arrow indicates that inspiration for each breath begins before expiratory flow has reached zero.

Auto-PEEP: Auto positive end-expiratory pressure; lpm: liters per minute.

Reproduced with permission: Negligan P. Auto-PEEP: Beware of auto-PEEP in pressure controlled ventilation. Critical Care Medicine Tutorials. Available at: http://www.ccmtutorials.com/rs/mv/strategy/page17.htm (Accessed on October 15, 2014). Copyright © 2002 Patrick Neligan.

Graphic 93546 Version 3.0

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Auto-PEEP: Time-flow graphic