Product Manual

Patient Monitor User Manual Calculation
- 136 -
CvO
2
ml/L
Calculated
venous oxygen
content
CvO
2
=(Hb)*1.34*SvO
2
/100%+(0.0031*PvO
2
)
20.4 Ventilation Calculation
20.4.1 Calculation Procedure
1. Select Menu > Common Function > Calculation > Ventilation.
2. Manually enter the values required on this interface. You can also directly obtain the values
of FiO
2
, RR, PIP and PEEP if they are available from the monitor by selecting Get Info.
3. Select Calculate to output parameter value.
20.4.2 Input Parameters
Items
Unit
English Full Name/Description
FiO
2
%
Percentage fraction of inspired oxygen
RR
rpm
Respiration rate
VT
ml
Tidal volume
PaCO
2
mmHg
Partial pressure of carbon dioxide in the arteries
PaO
2
mmHg
Partial pressure of oxygen in the arteries
RQ
/
Respiratory quotient
PEEP
cmH
2
O
Positive end-expiratory pressure
PEEPi
cmH
2
O
intrinsic PEEP
PeCO
2
mmHg
Partial pressure of mixed expiratory CO
2
PiO
2
mmHg
Inhalation oxygen partial pressure
Ppeak
cmH
2
O
The peak inspiratory pressure
20.4.3 Output Parameters
Items
Unit
English Full
Name/Description
Formula
PAO
2
mmHg
Partial pressure of
oxygen in the alveoli
PAO
2
= PiO
2
-PaCO
2
× [FiO
2
/100%+
(1-FiO
2
/100%) / RQ]
AaDO
2
mmHg
Alveolar-arterial
oxygen difference
AaDO
2
=PAO
2
-PaO
2
AaDO
2
/PaO
2
%
AaDO
2
/PaO
2
AaDO
2
/PaO
2
=(PAO
2
-PaO
2
)/PaO
2
*100%
MV
L/min
Minute volume
MV=VT*RR/1000
VD
ml
Volume of
physiological dead
space
VD= [(PaCO
2
-PeCO
2
)*VT]/PaCO
2