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RT Equations

Equations used in Respiratory Care

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