User's Manual

Ultraview Care Network
20-8
Performing In Vivo Calibration
In vivo calibration compares a drawn (measured) blood gas value with the value
displaying on the monitor. The catheter manufacturer recommends that the
oxygenation value be checked periodically. Several conditions may necessitate in
vivo calibration.
• Catheter was placed without pre-insertion calibration.
• Catheter has been in place for an extended period of time.
• Decaying light intensity values indicate possible damage to the fiber optics
(in this case, the catheter manufacturer recommends checking the
oxygenation value every 12-hours).
• You believe the saturation reading is incorrect.
Perform an in vivo calibration only when the patient’s oxygen saturation is
relatively stable and the intensity signal is within normal limits. When calibration
begins, the optical module stores the preceding 5-seconds of oxygen saturation
data.
Displaying Intensity Data
You can display a history of light intensity values superimposed over the
saturation trend graph. This combined display can be valuable for troubleshooting
because the quality of light passing the catheter tip directly affects the accuracy of
the saturation value. Successful monitoring ensures light intensity values remain
within the limits of the bar graph display.
Real time maximum and minimum intensity values display as vertical bars to each
side of a vertical row of dots. This display updates every 6-seconds. Horizontal
lines represent the recommended operating limits for light intensity.
Removing display of the intensity data does not affect storage of the data in
monitor memory, and the current intensity continues to display in the intensity bar.
Setting Alarm Limits
The current limits for venous oximetry display to the right of the parameter key.
You can set high or low saturation limits.
The alarm default is OFF. When you turn alarms ON:
• they default to a high of 80% and low of 60%.
• the exceeded limit key flashes.
• the limit value is displayed in the message area of the screen.
!
• Use only measured oxyhemoglobin saturation values from a co-
oximeter. Do not use values calculated from a laboratory blood
gas analyzer. Oxyhemoglobin values calculated on the basis of
PO
2
, pH, and temperature have been shown to be inaccurate.
To initiate in vivo calibration:
1 Touch SVO2.
2 Touch CALIBRATE.
3 Touch IN VIVO.
4 Touch YES.
5 Draw blood from the distal
lumen when the message
DRAW BLOOD is displayed
and send to lab for analysis.
6 Use arrow keys to adjust value
if displayed value differs from
lab value by more than four
saturation units.
To display a history of light
intensity values:
1 Touch SVO2.
2 Touch INTENSITY DISPLAY.
To set or adjust alarm limits:
1 Touch SVO2.
2 Touch ALARM LIMITS.
3 Select ALARMS ON.
4 Select HI= or LO=.
5 Use arrow keys to adjust.