The figure shows the pressure-time scalar for a pressure-support breath. To alleviate the problem depicted in this figure, the respiratory therapist should do which of the following?
a. Decrease the pres-sure setting c. Add inspiratory sloping
b. Increase the inspir-atory time d. Decrease the set volume
ANS: C
The scalar shows a pressure overshoot owing to the rapid flow rate at the very beginning of in-spiration. Adjusting the slope of the pressure and flow curves can change the rate of gas delivery at the very beginning of inspiration. This tapers the curves slightly until they reach their maximum value. Decreasing the pressure setting may alleviate the overshooting problem, but it does not provide the same level of assistance to the patient. Inspiratory time and volume are controlled by the patient in pressure-support ventilation and cannot be adjusted.
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