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RT Equations Matching
Equation Airway Resistance
Raw= (PIP-Plateau)/(Flow÷60) *Must be whole number *Answer given in Liters per second *Normal 0.6-2.4cmH2O/L/sec *Normal Vented 5-10cmH20/L/sec
Equation Deadspace to Tidal Volume Ratio
Vd/Vt= (PaCO2-PetCO)/PaCO2 *Pet= Exhaled CO *Deadspace= Ventilation w/o Perfusion
Equation Aveolar Air
PAO2= [(Pb-P H2O)×FiO2]-(PaCO2/0.80) or PAO2= [(Pb-p H2O)×FiO2]-(PaCO2×1.25) *Pb= Barometric Press (760 when not spec) *P H2O= 47 (mmHg)
Equation Minute Ventilation
Ve= Vt× f Vt=Tidal Volume f=Frequency or rate *Can be manipulated to determine other values
Equation Frequency needed for desired PaCO2
f= current rate× PaCO2/Desired PaCO
Equation Static Lung Compliance
Cst= Delivered Vt/(Plateau-PEEP) *Normal 100ml/cmH2O
Suction Catheter Sizing
(OETT Size/2)x 3= Cath Sz (French)
Equation O2 Cylinder Duration
E Cyl=0.28× psig/liter flow H Cyl=3.14× psig/liter flow **Full cyl= 2200psig (1800-2400)
Equation PaO2 to FiO2 Ratio
PaO2/FiO2 <200 is a critical value
Equation Predicted PaO2
PaO2= 105-(Age/2) or 100-(Age/3) *PaCO2 must be normal
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Created by: JimStry
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