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June 18 2013 02:04:45
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Respiratory Formulas:

  1. Oxygenation equations
  2. Alveolar arterial oxygen gradient
  3. Arterial oxygen content
  4. Mixed venous oxygen content
  5. Bohr dead space
  6. 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

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A-a Gradient Calculator

Parameters

PO2

PCO2

FiO2



A-a Gradient mm Hg

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

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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

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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

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Bohr Dead Space

Parameters

PalveolarCO2

PexpiredCO2




VD/Vt

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

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Static Lung Compliance

Parameters

VT

Pplateau

PEEP



Cs mL/cm H2O

Static Compliance = VT/Pplateau-Pend expiration
Norma >60 mL/cm H2O

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