Measuring ventilation ratios
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IMT Analytics AG
Since FlowAnalyser is able to measure flows in both directions of flow, it makes sense
to prefer connection variant A. With this measurement setup the flow is normally
selected as the trigger parameter. For this reason the flow triggers are stored in the
device as standard values and they can be restored at any time. The standard trigger
values for the flow trigger in adult ventilation are as follows, for example:
• Start trigger: Flow > 3 L/min
• End trigger: Flow < -3 L/min
You will find the other standard values in the Operation section: (6.14.2 Standard
trigger).
With connection variants B and C it is usually the pressure that is selected as the
trigger signal. In this case the standard requirements are as follows:
• Start trigger: Pressure > 1 mbar
• End trigger: Pressure < 1 mbar
Base flow is a constant flow that must not be included in volume calculation.
If, for example, a system has a defined leak, resulting in a continuous discharge of 3
L/min air, those 3 L/min are not included in the inspiratory volume. By entering
• Base flow: on 3.0 L/min
the volume calculation could be corrected in our example.
8.3 Standard trigger values
8.4 Base flow
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