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### Pressure Support The breath is triggered by meeting either a pressure or flow threshold. This type of ventilation is spontaneous, meaning the patient triggers the breath, and the tidal volume delivered varies based on the patient's effort. The inspiratory time only lasts as long as the patient i...

### Pressure Support The breath is triggered by meeting either a pressure or flow threshold. This type of ventilation is spontaneous, meaning the patient triggers the breath, and the tidal volume delivered varies based on the patient's effort. The inspiratory time only lasts as long as the patient is actively inhaling. The breath cycle ends when the patient's inspiratory flow reaches a preset value. ### Augmentation Augmentation of the patient's spontaneous breath with pressure improves alveolar ventilation which reduces hypercapnia and improves oxygenation. The degree to which alveolar ventilation improves is proportional to the amount of pressure support setting used. ### Inspiration Once inspiration begins, the ventilator targets a set pressure during inspiration. The flow will increase to build pressure in the circuit while the inspiratory phase is ongoing. When the pressure target is reached, flow begins to decay. The cycle ends when the inspiratory flow drops to a preset threshold, usually a percentage of peak flow.