Dräger Infinity M540 - Page 190

Calculations
190 Instructions for use – Infinity Acute Care System – Monitoring Applications VG6.n
The Cockpit uses the values in the preceding table, the laboratory values, and the BSA value to calculate
the following derived oxygenation and ventilation parameter values.
Label Description Derivation Available
units
C(a-v)O2 Arteriovenous oxygen dif-
ference
CaO2 – CvO2 mL/dL
CaO2 Arterial oxygen content 0.0134 x Hgb x SaO2 mL/dL
Cdyn Dynamic compliance VTe / (PIP – PEEP) mL/cmH
2
Cs Static lung compliance VTe / (Pplat – PEEP) or
VTe / (Pplat – PEEP)
mL/cmH2
CvO2 Venous oxygen content 0.0134 x Hgb x SvO2 mL/dL
DO2 Oxygen delivery 10 x CaO2 x C.O. mL/min
DO2I Oxygen index 10 x CaO2 x CI
DO2 / BSA
mL/min/m
2
MValv Alveolar minute volume (VTe – TVd phy) x RR mL/min
MVe Expired minute volume (VTe x RR) / 1000 L/min
MV/C.O. Ventilation cardiac output
ratio
MValv / C.O. No units
O2ER Oxygen extraction ratio (CaO2 – CvO2) / CaO2 No units
P(A-a)O2 Alveolar-arterial oxygen
difference
iO2 x (Pb –47) – PaCO2 – PaO2
iO2 / 100 x (Pb-47) – PaCO2 – PaO2
mmHg
Qs/Qt Intrapulmonary right-left
shunt (percentage shunt)
%
TVd phy
Tidal volume dead space
(physiological)
VTe x (1 – PeCO2 / PaCO2) mL
TVd/TV phy Ratio of tidal volume dead
space to tidal volume dead
space (physiological)
TVd phy / VTe No units
VO2 Oxygen consumption 10 x C(a-v)O2 x C.O. mL/min
VO2I Oxygen consumption in-
dex
10 x C(a-v)O2 x CI
VO2 / BSA
mL/min/m
2
NOTE: When multiple sources are available, the RR order of priority is RR, RRc, RRi.
Hgb 1.34 0.0031 PAaO2 CaO2–×+×
Hgb 1.34 0.0031 PaO2 CvO2–×+×
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