Measuring Ventilation Parameters; General - IMT Analytics FlowAnalyser PF-300 PRO User Manual

Measuring Ventilation Parameters

9 Measuring ventilation parameters
9.1

General

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To measure ventilation cycles, it is essential that FlowAnalyser PRO can read a venti-
lation cycle from the measured pressure and / or flow graphs. This is controlled using
the triggers.
Correct definition of the start and stop triggers is therefore of major importance and
it can have a considerable impact on the measurement results.
For triggering the ventilation cycles, the set triggers are used.
It is therefore very important for the triggers to be set correctly before the measure-
ment of ventilation parameters is started.
The start trigger is interpreted as the beginning of the inspiratory
phase. The stop trigger is interpreted as the end of the inspiratory
phase and as the beginning of the expiratory valve. Expiration contin-
ues until the next start trigger.
Automatic Trigger
The PF-300 PRO features an automatic trigger, which sets the limit to
detect the inspiration and expiration automatically.
If the automatic trigger is selected, no further trigger settings are
available.
For the automatic trigger to determine the limits reliably, the last
30 – 40 seconds of flow and pressure data is evaluated. Though the
automatic trigger works very reliably, it may take up to 40 seconds to
adapt to changed ventilation settings.
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