Calculations

Question 1

CALCULATIONS

EQUIPMENT OPERATION

Calibration of Blood Gas Electrodes?
(PO2, PCO2)

Answer 1

(PB - PH2O) X Fractional Concentration of Gas (Decimal)

Shortcut:
7 X Fractional Concentration of Gas (Decimal)
—Choose the closest answer

Question 2

CALCULATIONS

SPIROMETRY

Convert:

Inches to Centimeters

Answer 2

Inches X 2.54

Question 3

CALCULATIONS

SPIROMETRY

Smoking History (Pack Years)

Answer 3

of Packs X # Years Smoked

Question 4

CALCULATIONS

SPIROMETRY

Minute Volume (Ve)

Answer 4

Vt X RR

Question 5

CALCULATIONS

SPIROMETRY

FEV1/FVC%

Answer 5

FEV1 / FVC X 100

Question 6

CALCULATIONS

SPIROMETRY

MVV

Answer 6

Breaths X Volume of Each Breath X 5

Question 7

CALCULATIONS

SPIROMETRY

Estimate of MVV Effort

Answer 7

FEV1 X 40

Question 8

CALCULATIONS

SPIROMETRY

Post Bronchodilator % Change

Answer 8

(Post FEV1 - Pre FEV1) / Pre FEV1

Question 9

CALCULATIONS

SPIROMETRY

% of Predicted

Answer 9

Measured Value / Predicted Value for Patient X 100

Question 10

CALCULATIONS

LUNG TESTING

RV/TLC Ratio

Answer 10

RV / TLC X 100

Question 11

CALCULATIONS

LUNG TESTING

Boyles Law

Answer 11

P1 V1 = P2 V2

Question 12

CALCULATIONS

LUNG TESTING

PC 20% or PD 20%

Answer 12

Control Value FEV1 X 0.20

Question 13

CALCULATIONS

LUNG TESTING

% Change in FEV1

Answer 13

Control Value - Response Value / Control Value X 100

Question 14

CALCULATIONS

LUNG TESTING

Drug Dilution

Answer 14

Drug % X 10 = mg in 1 ml

Question 15

CALCULATIONS

LUNG TESTING

Airways Resistance (Raw)

Answer 15

Atmospheric (Mouth) Pressure - Alveolar Pressure / Flow

Question 16

CALCULATIONS

LUNG TESTING

Airway Conductance (Gaw)

Answer 16

1 / Raw

Question 17

CALCULATIONS

LUNG TESTING

Specific Conductance (SGaw)

Answer 17

1 / Raw / FRC or TLC

Question 18

CALCULATIONS

LUNG TESTING

Compliance (C)

Answer 18

Change in Volume / Change in Pressure

Question 19

CALCULATIONS

LUNG TESTING

Coefficient of Retraction (COR)

Answer 19

Pst at TLC / TLC

Question 20

DLCO

Answer 20

VCO mL of CO Diffusion per/minute
—— ——————————————-
PACO Alveolar Partial Pressure of CO

Question 21

CALCULATIONS

SPECIAL PROCEDURES

PaO2 (Estimate)

Answer 21

SaO2 - 30

Question 22

CALCULATIONS

SPECIAL PROCEDURES

Hct (Estimate)

Answer 22

Hb X 3

Question 23

CALCULATIONS

SPECIAL PROCEDURES

Total Hb

Answer 23

HbO2 + HbCO2 + HbCO + HbMet = 100%

Question 24

CALCULATIONS

EXERCISE TESTING

Treadmill Speed

Answer 24

Belt Length X Cycles /minute (RPM)

Question 25

CALCULATIONS EXERCISE TESTING Maximum Heart Rate

Answer 25

220 - Age

Question 26

CALCULATIONS EXERCISE TESTING Estimating Heart Rate from an ECG

Answer 26

Heart Rate = 300 / # Large Boxes Between “R” Waves Heart Rate = 1500 / # Small Boxes Between “R” Waves

Question 27

CALCULATIONS EXERCISE TESTING Treadmill Slope

Answer 27

Rise / Run

Question 28

CALCULATIONS EXERCISE TESTING MVV During Exercise (Estimate)

Answer 28

FEV1 X 40

Question 29

CALCULATIONS EXERCISE TESTING Frequency of Breathing or Respiratory Rate (f)

Answer 29

Breaths/Minute = Number of Accumulated Breaths / Testing Period (minutes)

Question 30

CALCULATIONS EXERCISE TESTING Alveolar Minute Ventilation (VA)

Answer 30

(Vt - Vd) X f OR VE - (Vd X f)

Question 31

CALCULATIONS EXERCISE TESTING Tidal Volume (Vt)

Answer 31

Ve / f

Question 32

CALCULATIONS EXERCISE TESTING Carbon Dioxide Production (VCO2)

Answer 32

FECO2 X Ve

Question 33

CALCULATIONS EXERCISE TESTING Respiratory Exchange Ratio (RER)

Answer 33

VCO2 (STPD) / VO2 (STPD) OR FeCO2 X Ve / VO2

Question 34

CALCULATIONS EXERCISE TESTING O2 Pulse (mL O2/beat

Answer 34

VO2 (STPD) / HR X 1000

Question 35

CALCULATIONS QUALITY ASSURANCE FVC Best Test

Answer 35

Highest FVC + FEV1

Question 36

CALCULATIONS QUALITY ASSURANCE Back Extrapolation (%)

Answer 36

Extrapolated Volume / FVC X 100