The graphics below indicate which of the following conditions?
a. Auto-PEEP
b. Active exhalation
c. Inadequate flow setting
d. Increased expiratory resistance
ANS: C
Inadequate flow during mechanical ventilation is shown in the figure on the pressure-time graph-ic by the concave pressure tracing while the flow curve is constant. Auto PEEP would be evident on the flow graphic when the exhaled flow does not return to zero before the beginning of the next breath. Active exhalation would be evident on the pressure graphic as a peak at the end of inspiration. Increased airway resistance would show as the exhaled flow not returning all the way to zero by the time the next breath begins.
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