Which mode of ventilation delivers the exact amount of pressure required to overcome the resis-tive load imposed by the ET tube for the flow measured at the time?
a. Automode
b. Volume-targeted PSV
c. Pressure support ventilation
d. Automatic tube compensation
ANS: D
ATC reduces the work of breathing associated with increased ET tube resistance. ATC is de-signed to deliver exactly the amount of pressure required to overcome the resistive load imposed by the ET tube for the flow measured at the time. In a sense, this is providing variable PSV with variable inspiratory flow compensation. Volume-targeted PSV maintains a target volume by var-ying the pressure support level. PSV provides an operator-selected set pressure for every sponta-neous breath. The automode can switch between time-triggered mandatory breaths and pa-tient-triggered, volume-targeted, pressure-limited breaths as long as the patient is breathing spontaneously.
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