The flow-time curve shows small oscillations after the peak flow rate has been reached. The res-piratory therapist can alleviate this by making which of the following ventilator adjustments?
a. Increase the set flow rate.
b. Increase the inspiratory time.
c. Decrease the inspiratory rise time.
d. Increase the inspiratory rise time.
ANS: D
The oscillations on the flow-time curve represent a phenomenon known as ringing, spiking, or overshoot. This is due to a nonsmooth breath delivery. Increasing the inspiratory rise time smooths out the breath delivery by increasing the time it takes for the ventilator to reach the set flow rate.
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