PFT Review

Definitions

100

VC

Amount of air you can exhale after a maximum inspiration

200

ERV

Amount of air you can exhale after a normal exhalation

300

VT

Volume inspired with a normal breath

400

IRV

Amount of air you can inhale after a normal inspiration

500

RV

Air left in the lungs after a maximum exhalation

PFT Testing

100

What is needed to perform a PFT

Height, Age, Weight, Ethnicity, Gender

200

For credible results for an FVC, the patient will exhale for how long?

6 Seconds

300

Normal TLC for an adult male?

6000 mls or 6L

400

What is the primary problem in obstructive lung disease?

Increased airway resistance

500

What pulmonary function test would you choose to assess effects of a possible tumor in the trachea?

Spirometry with flow volume loops

PFT Testing 2

100

Indications for PFT

Screening tool for pulmonary disease

Evaluation for surgical risk

Progression of Disease

200

Contraindications for PFT

Recent cataract removal

Unstable cardiovascular status

Hemoptysis with an unknown origin

300

What values are measured during spirometry

Tidal Volume

Forced expiratory volume in 1 second

Forced Vital Capacity

MVV

PEF

PIF

400

In advanced stages of pulmonary emphysema what volumes are usually increased?

FRC and RV

500

If PFT results are normal, but determining a test for bronchial provocation, what tests would you recommend for a patient?

Methacholine Challenge Test

Exercise Stress Test with FVC

PFT Testing 3

100

DLCO

Milliliters of gas the lung can transfer to the blood

200

Name the gas used to measure the lungs ability to transfer gas to the blood

CO

Carbon Monoxide 

300

Increased TLC with decreased DLCO will indicate which disease process?

Emphysema

400

What values assess effects of cigarette smoking in the smaller airways

FEF 25-75%

500

Interpret the PFT

Test               Actual          Predicted          %Predicted

FVC              2.0L                  4.0L                 50% 

FEV1             1.5L                  3.4L                 44%

FEV1/FVC      75%                  70%

TLC                2.4L                  4.8L                50%

Restrictive Lung Disease

PFT Testing 4

100

Total lung capacity is always reduced in what type of disorder?

Restrictive lung disease

200

< 35% is classified as what type of impairment in a PFT

Severe Impairment

300

What percentage of increase in spirometry testing determines if a bronchodilator is effective?

minimum 12%

400

What pulmonary measurement is the smallest?

Residual Volume

500

Interpret this PFT

Test        Actual         Predicted          % Predicted

FVC          3.9L               4.8L                   80%

FEV1        3.1L             4.1L                    85%

FEV1/FVC    79%          70%

Normal Results