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→PrismaLine Bi-Level Modes & Machines
The major factor affecting use of each mode, is the mask or tube seal. Volume targeted ventilation, needs a good seal to be effective, any leaks are counted towards volume delivered. Intubation ensures this seal.
Pressure targeted ventilation, which commonly use an external mask, naturally accounts for any leaks by simply ensuring that the pressure target is reached at all times. This can be done up until the point where you hit the leak redline, limiting the machines ability to meet its pressure target. PTV is the mode we are largely dealing with here.
'''PTV is the mode we are largely dealing with here.'''
With pressure targeted ventilation, obviously the correct therapy pressures must be set, but this is only the first part of the puzzle. Volume, is an important variable we must control. This is determined by the interaction of complex machine settings, user physiology and pulmonary condition. The variability of this system necessitates careful assessment of each of these three areas, to allow making informed choices when trying to achieve '''ventilation synchrony'''. This is a concept whereby machine and user are in time and satisfying the respiratory need, without fighting each other. This can cause arousal and very poor sleep quality, despite possibly having great apnea and hypopnea control.
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