8 CO
2
Monitoring
8.1 Overview
The defibrillator monitor uses infrared analysis to detect ETCO
2
. The principle is based on
the fact that CO
2
molecules can absorb infrared of specific wavelengths, and the amount of
energy absorbed directly reflects the ETCO
2
. When the infrared penetrates through the gas
sample containing CO
2
molecules, some of the energy in the infrared is absorbed by the CO
2
molecules, and the energy of the infrared is reduced. The remaining energy can be detected by
the photoelectric conversion element and can be converted into electrical signals. By comparing
this electrical signal with the infrared source energy, the amount of absorbed energy can be
calculated to determine the CO
2
concentration in the gas sample.
The mainstream CO
2
module can be configured on the i6 defibrillator monitor. The operating
temperature of the mainstream CO
2
module is 0-55℃.
CO
2
measurement provides:
1. A CO
2
waveform
2. End-tidal CO
2
value (EtCO
2
): the CO
2
value measures the carbon dioxide that is exhaled.
8.2 CO
2
Monitoring Display
The following figure shows the CO
2
monitoring screen:
8- 1 CO
2
monitoring display
1.CO
2
2.Current ETCO
2
3.CO
2
lower alarm limit