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Thursday, August 07, 2008

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Respiratory Formulas:

Oxygenation equations
Alveolar arterial oxygen gradient
Arterial oxygen content
Mixed venous oxygen content
Bohr dead space
Static compliance

Oxygenation Parameters

Parameters
FiO2	PCO2	PaO2	Hg
SaO2	SvO2	PvO2	CO

A-a Gradient < 10	CaO2 18-20 ml O2/100 ml blood	CvO2 13-16 ml O2/100 ml blood	Qs/Qt < 5 %
VO2 700-900 mL/min	DO2 220-300 mL/min	O2 _ER 024-0.4

A-a Gradient Calculator

Parameters
PO2	PCO2
FiO2

A-a Gradient mm Hg

A-a Gradient =
[(FiO₂/100) * (760 - 47)] - (PaCO₂/0.8)-PaO₂

Arterial Oxygen Content Calculator

Parameters
SaO2	PaO2
Hg

CaO2 ml O2/100 ml blood

Arterial Oxygen Content = 1.34 x Hb x Sao2 + 0.0031 x PaO2
Normal: 18-20 ml O2/ 100 ml blood

Mixed Venous Oxygen Content Calculator

Parameters
SvO2	PvO2
Hg

CvO2 ml O2/100 ml blood

Mixed Venous Oxygen Content = 1.34 x Hb x SvO2 + 0.0031 x PvO2
Normal: 13-16 ml O2/ 100 ml blood

Bohr Dead Space

Parameters
PalveolarCO2	PexpiredCO2

VD/Vt

Vd/Vt = PACO2-PexpiredCO2/PACO2
Normal: 0.2-0.3

Static Lung Compliance

Parameters
VT	P_plateau
PEEP

C_s mL/cm H2O

Static Compliance = VT/P_plateau-P_{end expiration}
Norma >60 mL/cm H2O

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