What is the purpose of measuring pressure support values above baseline pressure?

The purpose of measuring pressure support values above baseline pressure primarily relates to accommodating changes in airway resistance. In mechanical ventilation, pressure support ventilation allows for an increase in pressure to help support the patient's spontaneous breathing efforts. When there are variations in airway resistance — such as due to bronchospasm, secretions, or other factors affecting lung mechanics — increasing pressure support can help ensure the patient receives adequate tidal volumes and maintains sufficient ventilation.

By measuring and adjusting pressure support above the baseline, clinicians can respond effectively to these changes, ensuring that the pressures delivered support the patient's needs without causing undue strain or work of breathing. This is crucial in scenarios where airway resistance is altered, as it directly affects the efficiency of gas exchange and the patient's overall respiratory effort. Therefore, monitoring these values assists in optimizing ventilation strategies and enhancing patient outcomes during mechanical ventilation.