Equations used in Respiratory Care
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| Equation O2 Cylinder Duration | E Cyl=0.28× psig/liter flow
H Cyl=3.14× psig/liter flow
**Full cyl= 2200psig (1800-2400)
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| Equation FiO2 | FiO2=(O2 liter flow× 4)+20
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| 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)
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| Equation Predicted PaO2 | PaO2= 105-(Age/2) or 100-(Age/3)
*PaCO2 must be normal
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| Equation PaO2 to FiO2 Ratio | PaO2/FiO2
<200 is a critical value
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| Equation Minute Ventilation | Ve= Vt× f
Vt=Tidal Volume
f=Frequency or rate
*Can be manipulated to determine other values
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| Equation Frequency needed for desired PaCO2 | f= current rate× PaCO2/Desired PaCO
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| Equation RSBI (Rapid Shallow Breathing Index) | RSBI= f/Vt
*Must be less than 100 for successful weaning
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| Equation Deadspace to Tidal Volume Ratio | Vd/Vt= (PaCO2-PetCO)/PaCO2
*Pet= Exhaled CO
*Deadspace= Ventilation w/o Perfusion
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| Equation Static Lung Compliance | Cst= Delivered Vt/(Plateau-PEEP)
*Normal 100ml/cmH2O
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| Equation Dynamic Lung Compliance | Cdyn= Delivered Vt/(PIP-PEEP)
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| 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
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| Equation Ideal Body Weight | Men: 106+6(H"-60)=IBW#
Women: 105+5(H"-60)=IBW#
*Convert to metric #/2.2=Kg
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| Equation Tidal Volume | Vt (min)= IBW(Kg)× 10
Vt (max)= IBW(Kg)× 12
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| Equation Total Cycle Time | TCT= 60sec/f
I(time)= TCT/I+E
E(time)= TCT-I
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| Equation Temperature Conversion | Temp F°=(C°× 1.8)+32
Temp C°=(F°-32)÷ 1.8
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| Suction Catheter Sizing | (OETT Size/2)x 3= Cath Sz (French)
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Created by:
JimStry
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