Final answer:
In CPAP PSV mode, when a patient trigger is detected, the device provides an assisted breath at a set pressure level to ensure the airway remains open and reduces the breathing effort for patients with sleep apnea.
Step-by-step explanation:
When a patient using a CPAP (Continuous Positive Airway Pressure) device in PSV (Pressure Support Ventilation) mode triggers the system, the device delivers an assisted breath at a preset pressure level. This mode is often used in treating sleep apnea, where the CPAP machine helps to keep the airway open by providing a continuous stream of air through a mask. Pressure Support Ventilation enhances this by providing additional support when the patient initiates a breath, thus ensuring adequate ventilation throughout the night and reducing the work of breathing for the patient.