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44 / 106 HEYER Pasithec, Operator’s manual Rev. 0.2 Draft - 12/09
5. Flow-Volume Loop
Y-Axis: flow; inspiratory flow above 0 L/min level; expiratory flow below 0 L/min level.
X-Axis: tidal volume.
Figure 4-19 Flow-volume Loop
The “Save Reference” option can be used to preserve a loop for future reference. When a loop is
currently being displayed, or no loop is currently being displayed, Press “Save Reference” when either
a loop is currently being displayed or no loop is being displayed, and the next complete loop
(inspiration and expiration) will be saved as a reference.
After “Save Reference” is pressed down, the Pressure-Volume loop and Flow-Volume loop are
simultaneously preserved.
When “Save Reference” is pressed again, the system immediately deletes the current preserved
Pressure-Volume loop and Flow-Volume loop and preserves the two new reference loops.
When a user exits the loop function, the preserved loops are saved. When the working mode is
STANDBY, the two function loops are deleted.
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