In mechanical ventilation, what is the significance of a pressure support that is set too low?

When pressure support is set too low in mechanical ventilation, it means that the additional pressure provided to assist the patient’s inspiratory efforts is insufficient. This low level of support can lead to increased respiratory effort by the patient as they struggle to generate enough tidal volume on their own. Patients may have to work harder to overcome the resistance of the ventilatory system and their own lung mechanics, which can be exhausting and uncomfortable.

Inadequate pressure support means that the patient may not achieve an optimal tidal volume during each breath, which can lead to hypoventilation or inadequate gas exchange. Additionally, it may not significantly impact auto-PEEP, as that condition is generally a result of dynamics in respiratory mechanics and flow rates rather than the level of pressure support alone. Therefore, the balance of support provided by the ventilator is crucial in minimizing respiratory effort and maintaining patient comfort while ensuring effective ventilation.