I read that "PSV assists the patient's effort by delivering a positive pressure during inspiration. This reduces the work required to expand the lungs and overcome airway resistance, making breathing easier for the patient." I have difficulty understanding how the ventilator generates this positive pressure, especially since the patient is the one who is initiating and delivering the breath. In other words, what does it do to create this positive pressure? Any help is appreciated. Thanks.
The ventilator in PSV mode supports the patient's breathing by detecting the initiation of inhalation, then quickly providing a supportive, positive pressure that makes it easier for the patient to take a breath. The ventilator maintains this pressure during the inspiratory phase until the set parameters for switching to exhalation are met. This system reduces the work of breathing for patients who can breathe spontaneously but need assistance due to respiratory muscle weakness or other issues affecting their breathing.
https://evolve.elsevier.com/cs/product/9780323551274?role=student