Philips MX400 - Removing Exhaust Gases from the System; Suppressing Zero Calibration; Setting up all CO2 Measurements; Adjusting the CO2 Wave Scale

14 Monitoring Carbon Dioxide
250
Check the table in the Microstream CO
2
Accessories section of the Accessories chapter for typical
usage times for the different Microstream accessories.
CO
2
values for non-intubated patients using Microstream accessories will always tend to be lower than
for intubated patients. If values appear extremely low, check whether the patient is breathing through
the mouth or whether one nostril is blocked.
Removing Exhaust Gases from the System
WARNING
Anesthetics: When using the Microstream CO
2
measurement on patients who are receiving or have
recently received anesthetics, connect the outlet to a scavenging system, or to the anesthesia machine/
ventilator, to avoid exposing medical staff to anesthetics.
Use an exhaust tube to remove the sample gas to a scavenging system. Attach it to the MMS Extension
at the outlet connector.
Suppressing Zero Calibration
To prevent an automatic zero calibration from being started in the next five minutes,
•in the
Setup CO₂ menu, select No Zero for 5min, or select the Suppress CO₂ Zero SmartKey, if
configured.
Selecting
No Zero for 5min or selecting the Suppress CO₂ Zero SmartKey again before the timer has
timed out resets the timer to five minutes, unless an AutoZero became due during the previous
suppression.
Setting up all CO2 Measurements
These tasks are common to all CO
2
measurements except where otherwise noted.
Adjusting the CO2 Wave Scale
1 In the CO₂ Wave menu or the Setup CO₂ menu, select Scale.
2 Choose a suitable scale range from the pop-up list.
Setting up CO2 Corrections
Temperature, water vapor in the patient's breath, barometric pressure, and the proportions of O
2,
N
2
O
and Helium in the mixture all influence CO
2
absorption. If values seem inaccurately high or low, check
that the monitor is using the appropriate corrections.
Correction
Altitude
(M3014A only)
Altitude is set during installation. The monitor automatically applies an
appropriate correction.
O
2
(M3014A only)
In the
Setup CO₂ menu, select Oxy. Corr and select a value between 20%
and 100%, the default value is 20%. If you are not measuring the expired O
2
,
estimate it by subtracting 5% from the inspired O
2
then select the nearest
value from the list.