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Flashcards in Pulmonary Function Tests Deck (18)
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1

What is tidal volume?

Volume of air inspired and expired with each normal breath (~500mL)

2

What is forced vital capacity (FVC)?

Amount of air that can be forcefully expelled beginning with the lungs completely full and blowing maximally until the lungs are as empty as possible (~4600mL)

3

What is forced expiratory volume in first second (FEV1)?

Amount of air expelled during the first second of the FVC maneuver

4

What is residual volume (RV)?

Volume of air remaining in the lungs after the most forceful expiration (~1200mL)

5

What is total lung capacity (TLC)?

Max volume to which the lungs can be expanded with inspiration (~5800mL)

6

What are the indications for PFTs?

Dyspnea at rest or exertion, cough, asthma, COPD, suspected bronchiectasis or bronchiolitis, suspected ILD, suspected neuromuscular or chest wall disease

7

What is this graph?

Normal flow volume curve

8

What is this graph?

Normal flow volume loop

9

What does this graph show?

Moderate obstruction

10

What does this graph show?

Severe obstruction

11

What does this flow volume curve show?

Moderate restriction

12

What does this flow volume curve show?

Severe restriction

13

What does this flow volume loop show?

Variable extra thoracic obstruction (ex. vocal cord paralysis, airway burns, etc); flat inspiration and normal expiration

14

What does this flow volume loop show?

Variable intrathoracic obstruction (ex. airway trauma, airway inflammation, foreign body, etc); flat expiration, normal inspiration

15

What does this flow volume loop show?

Fixed obstruction (either intrathoracic or extra thoracic) include tracheal stenosis, bronchial stenosis, goiters, upper airway tumors

16

What does this flow volume loop show?

Obstructive lung pattern (lower airway)

17

What are common causes of OLD?

COPD, chronic bronchitis, emphysema, asthma, bronchiectasis, bronchiolitis

18

What are common causes of restrictive lung disease?

Abnormalities of chest wall or pleural (kyphosis, scoliosis, obesity, chronic pleural effusions, ankylosing spondylitis, etc), drugs, ILD, neuromuscular dz (ALS, Guillain-Barre syndrome, myasthenia gravis, etc)