Section G
AirWave System Operator’s Manual
20
WARNING!
The Carina Distance setpoint corresponds to the point where the ETT tip is at baseline
position. Setting the value correctly is important for accurate tracking of carina distance during
monitoring.
3. It is recommended to set the system baseline just before taking the chest x-ray, then setting the Carina
Distance value based on the measurement obtained from the x-ray. If a change in tube position and/or
re-baselining is required after this, the system will automatically update the Carina Distance setting
accordingly.
4. Once the Carina Distance has been set, use the
Return Arrow
to exit the screen. The system will
prompt to accept or cancel the change.
c. Sound Speed Correction
To adjust Sound Speed Correction settings, enter the
Sound Speed Correction Screen
(see Figure G-8) by
pressing the Gear Icon
and selecting
Sound Speed Correction
, which provides selection of the sound speed
correction method and the corresponding parameter for that method. These settings are used by the AirWave to
compensate for changes in the speed of sound caused by high oxygen concentrations (> 40%) or the presence
of anesthe
sia gases. Any change in sound speed changes the timing of the AirWave’s echoes and the system
needs to compensate for these changes to provide accurate results.
Figure G-8
NOTICE! For optimal accuracy, the Sound Speed Correction needs to be set to the correct setting.
Two sound speed correction methods are available:
1.
O2
– This manual correction method is intended for use in patients ventilated with oxygen, such as in the
ICU. When enabled, four oxygen concentration range selections are provided: 21-40%, 41-60%, 61-80%
and 81-100%.
a. Use up and down arrows to select Correction Method. Press the enter button to turn correction
method from yellow to white and select
O2.
Press Enter again
.
b. Use the down arrow to highlight the O2%, press Enter to turn percentages from yellow to white.
c. Select the up or down navigational arrow, and change the O2 to the range corresponding with the
patient O
2
.
d. Select the
Return Arrow
and accept the changes when prompted by the system.
e. The sound speed correction indicator (top right) shows the new setting.
2. Speed Factor
– This manual correction method is intended for use in patients ventilated with anesthesia.
The easiest way to change the Speed Factor is by using the
Alternate Method for Setting Sound
Speed Correction
later in this section.
a. Use up and down arrows to select Correction Method
Factor.
Press the enter button to turn
correction method from yellow to white and select
Factor.
Press Enter again
.
