Which of the following ventilator graphics could be used to assess the response to bronchodilator therapy for a patient receiving mechanical ventilation with VC-CMV?
1. Pressure-time scalar
2. Flow-time scalar
3. Pressure-volume loop
4. Volume-time scalar
a. 1 and 2 only
b. 3 and 4 only
c. 1 and 3 only
d. 1, 2, and 4 only
ANS: D
With VC-CMV, the volume-time scalar will remain constant. The expiratory portion of the flow-time scalar can show improvement if there is a response to the bronchodilator. The changes in PIP can be monitored with the pressure-time scalar and/or the pressure-volume loop.
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