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8. Loops, Trends & Waveforms
This chapter details the way the ventilator displays patient data. The ventilator
displays the realtime data collected from the proximal airway pressure transducer
and ET manifold mounted flow sensor to provide Pressure, Flow and Tidal
Volume waveforms. The ventilator can also display Loops based on the
pressure, flow and volume data, plus it can trend certain parameters against time.
The ventilator displays information in the following ways.
WAVEFORMS Pressure waveform
Flow waveform
Tidal volume waveform (Not available in HFO+CMV mode)
Note: The pressure waveform is always displayed when showing a loop or
trend.
LOOPS Flow Versus Volume loop (Not available in HFO+CMV mode)
Flow Versus Pressure loop (Not available in HFO & HFO+CMV mode)
Volume Versus Pressure loop (Not available in HFO & HFO+CMV mode)
TRENDS Minute Volume against time
Max Pressure against time
Mean Pressure against time
Min Pressure against time
FiO
2
against time
DCO
2
against time (Not available on the SLE4000)
Resistance against time
Compliance against time
8.1 Waveforms
The ventilators default display as already mentioned is the pressure, flow and
tidal volume waveforms. The waveforms appear in each window overlayed by a
grid which acts as a visual aid to measurement.
Within these windows and that of the Minute Volume window the user will find
the breath detection threshold and all the alarm thresholds that are user settable.
Note: The user can display the pressure waveform and the tidal volume
waveform only by selecting the Vte button in the Loops and Waveform
panel.
When changing the ventilatory parameters the axis in the windows autoscale to
best display the patient data.
The ventilator displays the waveforms within each window in real time. The
generated waveforms will slowly track across the window. The user can set all the
waveforms to be started in the same place by setting the Waveform display
sync to ON. (See “Waveform Display Sync” on page 52).
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