Auto Algorithm

Non-Responsive Apnea/Hypopnea (NRAH) logic
Clinical experience has shown that patients suffering from severe OSA will still have episodes of obstructive apneas above 10 cm h20. Physicians around the world have confidence in the REMstar Auto since it has the capability of managing patients who experience mild to severe OSA, while at the same time not increasing pressure on patients who may experience periods of central activity.

Other algorithms limit the treatment of apnea events above a fixed pressure level, resulting in under-treated patients. The REMstar Auto actually identifies when patients do not respond to pressure increases triggered by apneas or hypopneas.

If a persistent string of these events is detected, the device activates the Non-Responsive Apnea/Hypopnea (NRAH) logic, which limits pressure increases to 3 cm H2O. If at this time the patient continues to have events, the REMstar Auto will lower the pressure by 2 cm H2O and hold pressure for an extended period to stabilize the airway. This pattern of increasing pressure, followed by subsequently decreasing pressure, allows the REMstar Auto to appropriately manage events that are non-responsive to increases in pressure.

If the REMstar Auto identifies additional evidence that the events may be obstructive, such as snoring or hypopneas with flow-limited breaths, the REMstar Auto will temporarily override the NRAH logic and will increase pressure until the events are resolved.

This safe and effective method is unique to the REMstar Auto, and each occurrence is noted in our enhanced Encore reporting as NRAH events. Having the ability to identify and react to Non-Responsive Apnea/Hypopnea events at higher pressures allows the REMstar Auto to successfully titrate obstructive apnea events above 10 cm H2O.

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