Pulm equations

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Last updated 7:04 PM on 4/8/26
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11 Terms

1
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Pulmonary Ventilation (V T)

V T= Ventilation Rate x Tidal Volume

2
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Alveolar Ventilation (VA

Ventilation Rate x (Tidal Volume - Dead Space Volume)

3
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Alveolar vent given PaCO2

AV = CO2/PaCO2

4
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Net filtration equation

(Pi-Pc) - (Oc - Oi)

5
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Tracheal or inspired PO2

PIO2= FiO2*(Patm-PH2O)

6
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Alveolar Pressure of O2=

PAO2 = [FiO 2*(Patm-P H20)- (PACO 2/RQ)]

7
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Fick’s Law of Diffusion

DeltaP SA diff. coefficient) / Membrane Thickness

8
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Difference between alveolar and arterial pressure o

PAO 2 - PaO2

9
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Amount of O2 bound to hemoglobin

Total Hb (g/dl) x 1.34 ml O2/g Hb * SO2

10
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Amount of O2 dissolved in blood

PO2(mmHg) x 0.003 (ml O2/mmHg/dl)

11
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Total Carrying capacity in arterial blood=

CaO2= [Hb (g/dl) x 1.34 ml O2/g Hb * SO2] + [PO2(mmHg) x 0.003

(ml O2/mmHg/dl)]