Fluke Biomedical VT Plus HF - Manual (Page 39)

Connection and Setup
Setting Testing Parameters
2
2-11
Note
The Analyzer accepts barometric pressure values between 0 and 999
mmHg. No decimal values or fractions are allowed.
4. Press the ENTER soft key to save the change or the ESCAPE soft key to cancel the
change.
5. Press the BACK soft key to return to the Settings menu.
Breath Detection
The Analyzer can be used to measure parameters on a breath-to-breath basis. To measure
breath parameters, the mode of breath detection must be set. The breath detection options
are shown in Table 2-2 .
Table 2-2. Breath Detection Options
Option Description
Q Bi-directional breath detection – Use this breath detection mode when analyzing
both inspired and expired breath data or when the Analyzer is connected
between the load (lung simulator) and the Y-piece in the breathing circuit.
N Unidirectional inspired only – Use this breath detection mode when the Analyzer
is analyzing only inspired breaths or when the Analyzer is connected in the
inspired limb of the ventilator breathing circuit.
P Unidirectional expired only – Use this breath detection mode when the Analyzer
is analyzing only expired breaths or when the Analyzer is connected in the
expired limb of the ventilator breathing circuit.
Off Use this mode to measure continuous flow and volume without attempting to
detect breaths. Use this mode to integrate a flow over a long period of time.
Setting Breath Detection Mode
To select the breath-detection mode:
1. From the
Gas Settings menu, highlight Breath Detect .
2. Press the MODIFY soft key to toggle to the desired value.
3. Press the ENTER soft key to save the change or the ESCAPE soft key to cancel the
change.
4. Press the BACK soft key to return to the Settings menu.
Setting Breath Detect Threshold
The Analyzer breath detection algorithm uses a flow rate threshold that the flow must
cross to trigger a change in the breath phase. Higher flow rate thresholds yield less
sensitive breath detection. Lower thresholds yield more sensitive breath detection.
To enter the breath detect threshold:
1. From the
Gas Settings menu, highlight LF Threshold to adjust the low-flow
threshold or BD Threshold to adjust the high-flow threshold.
2. Press the MODIFY soft key to display the value field.
3. Input the desired value from the keypad.