pressure

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This lower or negative pressure creates a negative deflection in the PAWP tracing (Booker & Arnold, 1993).
In positive pressure ventilation such as assist control or pressure control ventilation, the ventilator forces the mixture of gas into the lungs during inspiration and creates a higher intrathoracic pressure, thereby creating a higher pressure waveform in the PAWP tracing during inspiration.
The PAWP is a difficult parameter to interpret during pressure support ventilation (Ahrens, 1999).