Flow Shape Settings - ResMed Astral Series Clinical Manual

Ventilation modes

Flow shape settings

The Astral device supports four flow shape settings:
1. 100% (Constant)
2. 75%
3. 50%
4. 25%
The figure illustrates how Flow Shape affects breath delivery for a fixed volume. With volume breath
option set to PIF (Peak Inspiratory Flow), adjusting the flow shape alters the inspiratory duration,
whereas with volume breath option set to Ti (Inspiratory time), adjusting the flow shape alters the Peak
Inspiratory Flow.
When the flow shape is set to 100%, the flow is generally constant during inspiration. For decreasing
percentages, the flow starts at the peak flow and declines to approximately the percentage setting of
this value at the end of inspiration.
To select between Ti and PIF options:
1. From the Setup menu select Device config.
2. Select Units
3. Select Ti or PIF.
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