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SPC Mech Vent Equa
SPC Mechanical Ventilation Equations
Question | Answer |
---|---|
Deadspace | Vd/Vt = PaCO2-PeCO2/PaCO2 |
P/F Ratio | PaO2/FiO2 |
PAO2 | FiO2(713)-PaCO2/.8 [don't use .8 if FiO2 > 60%] |
A-a Gradient | FiO2(713)-PaCO2/.8 = PAO2 - PaO2 |
TCT | 60/rr |
I:E Ratio | TCT - [I/E time] = I/E time --- I:E (simplified) |
Minute Ventilation (Ve) | Vt x rr |
Static Compliance (Cs) | Vt/Plat - Peep |
Dynamic Compliance (Cd) | Vt/Peak - Peep |
Resistance (Raw) | Peak - Plat/flow |
RSBI | f/Vt |
O2 Content | (1.34 x Hb x SaO2) + (PaO2 x 0.003) |
Cylinder Duration | Tank Pressure x Tank Factor / L/m |
Alveolar Ventilation (Va) | (Vt - Vd) x rr = Va |
Air:O2 Ratio & Total Flow | 100 - FiO2 / FiO2 - 21 = Air:O2 ratio x flowrate = ___Total Flow |
Shunt (Qs/Qt) | CcO2 - CaO2 / CcO2 - CvO2 = Qs/Qt = ___% |