7-2
For mainstream CO
2
module, besides the above mentioned CO
2
waveform and EtCO
2
monitored parameter, the measurement also provides:
1. V- CO
2
loop
2. Monitored parameters:
Vdaw: airway dead space.
Vdaw/TVe: ratio of airway dead space to tidal volume.
Vtalv: alveolar tidal ventilation.
V’alv: alveolar minute ventilation.
slopeCO
2
: CO
2
rising slope.
V’CO
2
: CO
2
elimination.
VeCO
2
: exhaled CO
2
volume.
ViCO
2
: inspired CO
2
volume.
Some monitored parameters of the mainstream CO
2
module (Vdaw, Vdaw/Tve, Vtalv, V’alv,
slopeCO
2
, V’CO2, VeCO
2
, ViCO
2
) have reference significance only when the patient is in
stable ventilation status. Stable ventilation status refers to the following situations:
Patient is at rest for at least 30 minutes.
Mechanical ventilation parameters (RR, TV, and etc) remain unchanged.
No operations that may affect the patient’s gas exchange or metabolism.
Some monitored parameters of the mainstream CO
2
module may be inaccurate in the
following situations. The affected parameters include Vdaw, Vdaw/Tve, Vtalv, V’alv,
slopeCO
2
, V’CO2, VeCO
2
, ViCO
2
.
System leakage
Patient ventilation condition is unstable
High frequency ventilation (HFV)
Breathing frequency greater than 35/min
Neonate patient
Non-invasive ventilation type
Other circumstance causing wrong CO
2
and Flow measurements
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