Work Shifting on Autoflow: Comparison Against Pressure Support

Why some patients receive more support on pressure support than on adaptive modes susceptible to work shifting.

APVPSVWork shiftingM2M5

Fig 1.This patient was on Autoflow with SIMV (the pressure-controlled mode with an adaptive targeting scheme, called Autoflow, comes as an “add-on” to traditional VC in Drager ventilators, that is why you see VC on the screen although this is NOT volume control). On this ventilator, pressure support breaths are colored in brown. Note how airway pressures rise more during inspiration on PS breaths than in Autoflow breaths. This is because the ventilator is applying higher pressures with the pressure support breaths (set to deliver 5cmH2O above PEEP in this case) than in the mandatory Autoflow breaths (on this ventilator, applied pressure above PEEP may be as low 0,1cmH2O). This case illustrates that some patients will receive more support in PSV rather than in modes with mandatory rates that may be susceptible to work shifting, such as Autoflow.

Learn the concept behind this case

Comprehensive · M2 — APV & work shifting

Comprehensive · M2 — Pressure Support & Volume Support

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