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DOS (PFT’s) > Pulmonary Function Testing > Flashcards

Pulmonary Function Testing Flashcards

1
Q

Volume of air inhaled/exhaled during normal breathing

A

Tidal Volume (Vt)

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2
Q

Maximal volume of air which can be inhaled after inhaling a normal Tidal volume

A

Inspiratory reserve volume (IRV)

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3
Q

Maximum volume of air exhaled after exhaling normal tidal breath

A

Expiratory reserve volume (ERV)

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4
Q

Volume of air remaining in lungs after maximal exhalation

A

Residual volume (RV)

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5
Q

Capacity which includes IRV+Vt

A

Inspiratory Capacity

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6
Q

Capacity which includes RV+ERV

A

Functional residual capacity (FRC)

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7
Q

Capacity which includes IC+Vt+ERV

A

Vital Capacity

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8
Q

Capacity which includes RV+Vt+ERV+RV

A

Total lung capacity

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9
Q

What are the 5 main PFTs

A 
Spirometry
Lung volumes and capacities
Diffusion studies
Bronchial Provocation
Stress Testing
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10
Q

What measurement will tell you if a pt has an obstructive dz of the medium to small airways?

A

FEF 25%-75%

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11
Q

What measurement evaluates the larger upper airways?

A

FEF 200-1200

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12
Q

ATS standards for accuracy regarding Flow vs Volume

A

Volume has to be <3% error or 50mL

Flow has to be 95% or 0.2L/sec

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13
Q

An SVC reading that is greater than the FVC value would be indicative of what?

A

Airway OBSTRUCTION

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14
Q

What does it mean when it says its measured in ATPS

A

It measures ambient temp,pressure, and water saturation

**AKA measures at room temp, room pressure, ect

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15
Q

When looking at a flow-volume loop, where can you locate the flow and volume?

A

Flow will be on vertical axis in LITERS/SECOND

Volume on horizontal axis in LITERS

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16
Q

What are the spirometry tests?

A

FVC, SVC, MVV

17
Q

definition of back extrapolated volume

A

When beginning the forced exhalation, it is the amount of air that is exhaled slowly before forced exhalation begins

18
Q

What value compares the amount of air exhaled in 1 second to total amount of exhaled air during a FVC

A

FEV1/FVC ratio

19
Q

When looking at a flow-volume loop, where can you locate the flow and volume?

A

Flow will be on vertical axis in LITERS/SECOND

Volume on horizontal axis in LITERS

20
Q

What test maneuver can result in back-extrapolated volume?

A

FVC

21
Q

definition of back extrapolated volume

A

When beginning the forced exhalation, it is the amount of air that is exhaled slowly before forced exhalation begins

22
Q

Which values cannot be obtained from normal spirometry?

A

RV, TLC, and FRC

23
Q

What are signs that you shouldn’t do the methacholine test?

A

Wheezing, dyspnea, unstable cardiac, low PaO2

**Probably meaning <40mmHG PaO2

24
Q

When should a nitrogen wash out be done?

A

AFTER a methacholine test was performed and came back normal but pt is still experiencing asthma like symptoms

25
Q

Which of the gas dilution techniques are closed system vs open system?

A

Nitrogen wash out is open system while the helium dilution is a closed system

26
Q

N2 wash out summary

A

Pt will breath 100% oxygen and a nitrogen analyzer in the circuit monitors the nitrogen concentrations. measurement starts at resting exhalation. This will allow you to assess the RV**

27
Q

What are signs that you shouldn’t fdo the methacholine test?

A

Wheezing, dyspnea, unstable cardiac, low PaO2

**Probably meaning <40mmHG PaO2

28
Q

What are the four ways that the Nitrogen wash test is over?

A 
1 nitrogen levels are 1-3% or less
2 leak has occured
3 pt cannot continue
4 test reaches 7 minutes
***If you need to repeat the test after the 7 minute mark....you need to wait at least 15 minutes
29
Q

The nitrogen wash test reporting higher values is indicative of what?

A

Impaired air distribution (air trapping)

DOES NOT MEASURE TRAPPING only calculates air trapping

30
Q

N2 wash out summary

A

Pt will breath 100% oxygen and a **nitrogen analyzer in the circuit monitors the nitrogen concentrations

31
Q

If you are performing an N2 washout test and you notice a marked increase of exhaled Nitrogen, what should you do?

A

This is indicative of a leak and the test must be repeated.

32
Q

What are the three ways that the Nitrogen wash test is over?

A

1 nitrogen levels are 1-3% or less
2 leak has occured
3 pt cannot continue

33
Q

What is the maximum length of time that a Nitrogen wash can go?

A

7 minutes

34
Q

Which test can evaluate airway resistance and compliance

A

Body Plethysmography

DOS (PFT’s) (4 decks)

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