An intubated patient is receiving mechanical ventilation with the following settings: VC-CMV, rate = 18, VT = 850 mL (10 mL/kg), PEEP = 5 cm H2O, flow rate = 40 L/min. The patient is se-dated and is not assisting the ventilator

During a patient-ventilator system check, the respiratory therapist observes the following venti-lator graphic:

The respiratory therapist should do which of the following?
a. Decrease the flow rate.
b. Increase the PEEP.
c. Decrease the rate.
d. Increase the VT.


ANS: C
The figure clearly shows air trapping, as evidenced by failure of the expiratory portion of the curve to return to zero. Auto-PEEP should be suspected whenever flow does not return to base-line in the flow-volume loop. Efforts to reduce auto-PEEP can be aided by reducing the inspira-tory time, minute ventilation, and Raw. Decreasing the rate in this case would decrease the minute ventilation. Decreasing the flow rate would increase the inspiratory time, worsening the air trap-ping, and auto-PEEP. Increasing PEEP may make it easier for the patient to trigger the ventilator, but it would not reduce the air trapping. Increasing the VT would worsen the air trapping.

Health Professions

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The heart has its own vascular system.

Answer the following statement true (T) or false (F)

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An oral carbohydrate is necessary to reduce the symptoms of _________________ in a conscious patient

Fill in the blank(s) with correct word

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