Introduction 9
DreamStation BiPAP autoSV User Manual
1.5 System overview
1.5.1 Device description
The device is intended to augment patient breathing by supplying pressurized air through a patient circuit.
It senses 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 you inhale, and a
lower pressure, known as EPAP (Expiratory Positive Airway Pressure), when you exhale. The higher pressure
support your inhalation, and the lower pressure makes it easier for you to exhale.
When prescribed, the device can also provide features to help make your therapy more comfortable. The
ramp function allows you to lower the pressure when trying to fall asleep. The air pressure will gradually
increase until the prescription pressure is reached. Additionally, the Flex comfort feature provides increased
pressure relief during the expiratory phase of breathing.
Several accessories are also available for use with the device. Contact your home care service provider to
purchase any accessories not included with your system.
1.5.2 Therapy features
If prescribed for you, the device provides the following therapy features.
1.5.2.1 Bi-Flex comfort feature
If enabled, the device provides a comfort feature called Bi-Flex. The Bi-Flex attribute adjusts therapy
by inserting a small amount of pressure relief during the latter stages of inspiration and during active
exhalation (the beginning part of exhalation). Bi-Flex levels of 1, 2, or 3 progressively reflect increased
pressure relief that will take place at the end of inspiration and at the beginning of expiration.
