Which of the following flow-termination settings for a pressure-supported breath that has a peak inspiratory flow of 30 L/min would allow enough time for a visible plateau on the pressure-time curve?
a. 5 L/min c. 20% of peak flow
b. 20 L/min d. 30% of peak flow
ANS: A
The longest inspiratory time provides a visible plateau on the pressure-time scalar. This is caused by a flow termination that takes the longest time to reach. The flow termination that is lowest provides the most visible plateau on a pressure-time scalar. Because 20% of the peak flow of 30 L/min is 6 L/min and 30% of 30 L/min is 9 L/min, the lowest flow in this case is 5 L/min.
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