Which factor is set in pressure support ventilation?

In pressure support ventilation, the key factor that is set is the pressure limit. This setting determines the level of inspiratory pressure that will be delivered to the patient during each breath. The ventilator provides support by delivering a predetermined level of pressure for a set amount of time or until the patient initiates a breath. The aim is to assist the patient in their own breathing efforts rather than controlling all of their breath characteristics.

The other factors, such as tidal volume and respiratory rate, are not directly set in pressure support ventilation. Instead, these can vary based on the patient's effort and lung mechanics. Minute ventilation, which is the product of respiratory rate and tidal volume, also depends on the patient's ability to breathe and may fluctuate rather than being fixed by the ventilator settings. Therefore, the pressure limit is the critical parameter that ensures the ventilator supports the patient's inspiratory effort effectively.