3-19
End Tidal Carbon Dioxide (ETCO2) (Prism Only)
End tidal carbon dioxide (ETCO2) monitoring can show early indications of circulatory and
pulmonary problems. In order to have a “normal” ETCO2 (CO2) reading a patient must have
active cellular metabolism that produces CO2, a functional cardiovascular system to transport
CO2 to the lungs and a normal intrinsic pulmonary function or proper ventilator-assist function.
The Prism monitor uses infrared absorption spectroscopy to measure CO2. MDE’s self-
calibrating sensor directs a single infrared beam through both a sampling chamber containing
patient exhaled CO2, and a reference chamber containing a known concentration of CO2. Based
on a comparison of these two values, the monitor calculates the patient’s CO2 concentration for
each exhaled breath.
Both the mainstream and sidestream sensor continuously measures the level of CO2 during
inspiration and expiration, and detects changes of CO2 levels during the respiratory cycle. These
changes are shown on the CO2 capnogram waveform, with numeric values reflecting the highest
level of CO
2
detected at the end of expiration. Additionally, the monitor senses and displays
respiration rate (if CO2 is selected as the respiration source), measures inspired CO2 (ICO2) to
compare to an adjustable ICO2 alarm limit, and provides the ability to compensate for oxygen
(O2) and nitrous oxide (N2O) greater than 50%.
ETCO2 setup:
1. Press the softkey next to ETCO2 label to open the ETCO2 Setup menu.
ALM
ON
OFF
ALM
LIM
SCALE
50
75
MM/S
12.5
6.25
CO2
ON
OFF
MORE
2. Press the ALM ON/OFF softkey to set patient alarms.
3. Press the ALM LIM softkey to adjust alarm values.
4. Press the SCALE softkey to chose appropriate scale.
5. Press the CO2 OFF to turn off ETCO2 function. Turn ETCO2 off after conclusion of
monitoring to prevent technical messages on screen.
6. Press the MORE softkey to view and select the UNIT softkey (% or mmHg), O2 ON/OFF
compensation softkey, or N2O ON/OFF compensation softkey.
UNIT
%
mmHg
O2
ON
OFF
N2O
ON
OFF
ETCO2 allows numeric information and waveform to be displayed. ETCO2 waveform can be
placed in a trace slot. Refer to configuration instructions.
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