Decelerating flow waveform, what should we expect from it?




Last update: Tuesday, 31 Mar 2015 at 19:20

A patient was mechanically ventilated in the volume cycled ventilation (A/C-VCV) mode with an inspiratory time of 1s, 30 l/min of maximum inspiratory flow, square waveform type, and a tidal volume of 500 ml, as it is seen in the ventilator curves below:

What would be expected to happen with the inspiratory time and the peak airway pressure if the flow square waveform was changed to the decelerating “ramp” type, considering that the maximum insp. flow would be kept the same?

a) Increase of both the insp. time and the peak airway pressure
b) Increase of the insp. time and decrease of the peak airway pressure
c) Reduction of both the insp. time and the peak airway pressure
d) Reduction of the insp. time and increase of the peak airway pressure



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