The devices are intended to augment patient breathing by supplying pressurized air through a patient circuit.They sense the patient’s breathing effort by monitoring airflow in the patient circuit and adjusts its output to assist in inhalation and exhalation. This therapy is known as Bi-level ventilation. Bi-level ventilation provides a higher pressure, known as IPAP (Inspiratory Positive Airway Pressure), when inhaling, and a lower pressure, known as EPAP (Expiratory Positive Airway Pressure), when exhaling.

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