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Are there specific factors that are controlled by the ventilator itself that may affect tidal volume delivery in pressure control?
Yes. Here are a few possibilities:Location of pressure monitoring: mainflow outlet, proximal airway, exhalation valvePressure may be very different in the three locations and therefore volume delivered when mainflow, prox or exhalation valve pressure is 40 cmH2O will be different. The same goes for the PEEP level. Pressure control setting may need to be adjusted if you move between ventilators that monitor in different places. Pressure control setting may be a target pressure or it may be a target CHANGE in pressure.If PC is set at 40 and PEEP at 10, the actual change in pressure for the patient may be 30 or it may be 40 cmH2O. A difference like this may significantly impact volume delivery and should always be considered when changing between ventilators. The rate of pressure rise will impact volume delivery. Slower rise = lower volume delivery at the same insp. time. Faster rise = higher volume delivery at the same insp. time. In patients with high flow demand, you may need to increase the target pressure on the HT50 when switching from a ventilator with a faster pressure slope/rise.
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