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FREE RESPIRATORY THERAPY AND STUDY GAMES ABOUT
RT EQUATIONS EXAM QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -17 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation
Question 1: Equation
O2 Cylinder Duration
Answer:
E Cyl=0.28× psig/liter flow H Cyl=3.14× psig/liter flow **Full cyl= 2200psig (1800-2400)
Question 2: Equation
Ideal Body Weight
Answer:
Men: 106+6(H"-60)=IBW#
Women: 105+5(H"-60)=IBW#
*Convert to metric #/2.2=Kg
Question 3: Equation
RSBI (Rapid Shallow Breathing Index)
Answer:
RSBI= f/Vt *Must be less than 100 for successful weaning
Question 4: Equation
Dynamic Lung Compliance
Answer:
Cdyn= Delivered Vt/(PIP-PEEP)
Question 5: Equation
Tidal Volume
Answer:
Vt (min)= IBW(Kg)× 10 Vt (max)= IBW(Kg)× 12
Question 6: Equation
Temperature Conversion
Answer:
Temp F°=(C°× 1.8)+32 Temp C°=(F°-32)÷ 1.8
Question 7: Equation
Minute Ventilation
Answer:
Ve= Vt× f Vt=Tidal Volume f=Frequency or rate *Can be manipulated to determine other values
Question 8: Equation
Predicted PaO2
Answer:
PaO2= 105-(Age/2) or 100-(Age/3) *PaCO2 must be normal
Question 9: Equation
Deadspace to Tidal Volume Ratio
Answer:
Vd/Vt= (PaCO2-PetCO)/PaCO2 *Pet= Exhaled CO *Deadspace= Ventilation w/o Perfusion
Question 10: Equation
Frequency needed for desired PaCO2
Answer:
f= current rate× PaCO2/Desired PaCO
Question 11: Equation
Static Lung Compliance
Answer:
Cst= Delivered Vt/(Plateau-PEEP) *Normal 100ml/cmH2O
Question 12: Equation
FiO2
Answer:
FiO2=(O2 liter flow× 4)+20
Question 13: Equation
PaO2 to FiO2 Ratio
Answer:
PaO2/FiO2 <200 is a critical value
Question 14: Equation
Airway Resistance
Answer:
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
Question 15: Equation
Aveolar Air
Answer:
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)
Question 16: Equation
Total Cycle Time
Answer:
TCT= 60sec/f I(time)= TCT/I+E E(time)= TCT-I
Question 17: Suction Catheter Sizing
Answer:
(OETT Size/2)x 3= Cath Sz (French)
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