O2	Oxygen
CO2	Carbon dioxide
CaO2	Arterial O2 content
CcO2	Pulmonary end-capillary O2 content
CvmixO2	Mixed venous O2 content
CvO2	Venous O2 content
Cpre-oxyO2	Pre-oxygenator O2 content
Cpost-oxyO2	Post-oxygenator O2 content
Ccapillary-oxyO2	O2 content of ‘capillary’ blood in the oxygenator
Ppre-oxyO2	Pre-oxygenator O2 partial pressure
Ppost-oxyO2	Post-oxygenator O2 partial pressure
PAO2	Alveolar O2 partial pressure
PaCO2	Arterial CO2 partial pressure
Cpre-oxyCO2	Pre-oxygenator CO2 content
Cpost-oxyCO2	Post-oxygenator CO2 content
Ppost-oxyCO2	Post-oxygenator CO2 partial pressure
PCO2ML (exp)	CO2 partial pressure in the membrane effluent gas
PCO2ML (pre)	Pre-oxygenator (or pre-membrane) CO2 partial pressure
PexpCO2	CO2 partial pressure in the membrane effluent gas
FiO2	Fraction of inspired O2
FdO2	Fraction of delivered O2
DO2	Oxygen delivery
CO	Cardiac output
Qt	Total cardiac output
Qs	Shunt flow
Qs/Qt	Shunt fraction
Qr	Recirculating blood flow
ECBF	Extra corporeal blood flow
SGF	Sweep gas flow
VO2	O2 consumption
VO2ML	O2 transfer of the membrane lung
VCO2	CO2 production
VCO2 TOT	Total CO2 clearance
VCO2ML	Amount of CO2 removed by membrane lung
VCO2 NL	Amount of CO2 removed by native lung
VCO2 (D)	CO2 transfer across the membrane, calculated as per Douglas
VCO2 (CORR)	VCO2 corrected for a standard inlet PCO2 of 6 kPa
V DSML	Membrane lung dead space
ΔP	Predicted difference in driving pressure
κ	Correction factor
CRS	Static compliance of the respiratory system
V Dalv/VT	Alveolar dead space fraction
RR	respiratory rate
H2O	Water
H2CO3	Carbonic acid
H+	Hydrogen ion
HCO3−	Bicarbonate ion
Hb	Haemoglobin
HbO2	Oxygenated haemoglobin
HbH+	Reduced haemoglobin
P H2O	Partial pressure of water
Patm	Atmospheric pressure