Which of the following are characteristics of a ventilator that function as a true volume control-ler?
1. Its pressure waveform changes with changes in lung mechanics.
2. It measures and uses volume to control the volume waveform.
3. Its volume waveform stays constant with changes in lung mechanics.
a. 1 and 2 only
b. 1 and 3 only
c. 2 and 3 only
d. 1, 2, and 3
ANS: D
If the ventilator controls volume, the volume and flow waveforms will remain consistent, but pressure will vary with changes in respiratory mechanics. To qualify as a true volume controller, a ventilator must measure volume and use this signal to control the volume waveform.
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