16-2
16.3 Measurement Limitations
The following factors may influence the measurement accuracy:
Leaks or internal venting of sampled gas
Mechanical shock
Cyclic pressure up to 10 kPa (100 cmH
2
O)
Other sources of interference, if any
Measurement accuracy may be affected by the breath rate and inspiration/expiration (I/E)
ratio as follow:
EtCO
2
value is within specification for breath rate 60 bpm and I/E ratio 1: 1;
EtCO
2
value is within specification for breath rate 30 bpm and I/E ratio 2: 1.
Measurement accuracy is unspecified for breath rate larger than 60 bpm.
16.4 Understanding CO
2
Display
The CO2 parameter and waveform areas provide FiCO2 measurement, EtCO2 measurement,
awRR measurement, and a CO
2 waveform.
(1) CO
2 waveform
(2) Fraction of inspired CO
2
(FiCO2)
(3) End tidal CO
2
value (EtCO2)
(4) Airway respiration rate (awRR)
(1)
(3)
(4)
(2)
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