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Proportional Pressure Support & PAV+

The ventilator operates by utilizing the equation of motion of the respiratory system to generate instantaneous rate and tidal volume of gas flow from the ventilator to the patient. This equation of motion explains how the pressure generated by the respiratory muscles is used to counteract the elastic and resistive forces acting upon the respiratory system. PAV mode reduces the inspiratory effort required to overcome respiratory elastance and resistance by providing pressure in proportion to the patient's need and effort. In pressure support mode, a fixed driving pressure (i.e. inspiratory pressure) is used for support. However, with PAV mode, there is no predetermined target for flow, volume, or pressure, which allows the patient to control their own ventilatory pattern, determining their own rate, volume, and timing of each breath. PAV provides flow and volume assistance, with greater patient effort resulting in increased pressure from the ventilator, decreasing the work of breathing and thus reducing the need for sedation. This pattern of support is the opposite of PRVC, where increased work by the patient results in less support from the ventilator