4-7
Spirometry loops reflect patient lungs function and ventilation condition as well, such as the
patient’s lungs compliance, over-inflation, breathing system leakage and airway blockage.
The system provides three types of spirometry loops: P-V (pressure-volume) loop, F-V
(flow-volume) loop, and F-P (flow-pressure) loop. The data of P-V loop, F-V loop and F-P
loop come from pressure, flow, and volume waveform data. When a mainstream CO
2
module
is configured, a V-CO
2
loop can be displayed, as shown below.
Up to two types of spirometry loop are displayed at a time. To select the desired loop:
1. Select [Spirometry] on the main screen.
2. Select [Spirometry 1] or [Spirometry 2] to set the desired loop or V-CO
2
loop to be
displayed.
The ventilator provides the function of reference loop. When [Save Ref.] is selected, the loop
of current breathing cycle is saved as reference loop, and the time when the reference loop is
saved is displayed. By selecting [Display Ref.] and then selecting time, the reference loop
saved at that time can be viewed. By selecting [Display Ref.] and then selecting [OFF], the
currently displayed reference loop is hidden.
The ventilator saves up to 5 reference loops. If 5 reference loops are already saved, when
[Save] is selected again, the system automatically clears the oldest reference loop and saves
the loop of current breathing cycle as reference loop.
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