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Pulmonary Function Testing NBRC > Spirometry Testing B > Flashcards

Spirometry Testing B Flashcards

1
Q

What is the definition of a PEF or PEFR?

A

The maximum flowrate achieved during a forced expiratory maneuver

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2
Q

What is a typical PEFR?

L/sec and L/min

A

10 L/sec or 600 L/min

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3
Q

What is the significance of a PEFR?

A

Measures asthma severity

Measures gross changes in airway function before/after bronchodilator administration.

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4
Q

If PEFR readings are consistently decreasing, this may indicate ___.

A

Fatigue

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5
Q

What piece of equipment can be used to measure PEFR?

A

Wright Respirometer

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6
Q

What is the definition of an FEF 200-1200?

A

The average flowrate that occurs during a forced expiratory maneuver after the first 200ml has been expired.

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7
Q

What is the typical value of a FEF 200-1200?

A

6 L/sec

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8
Q

What is the significance of a FEF 200-1200?

A

Measures airflow within large airways.

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9
Q

What can you suspect if the patient has

a low FEF 200-1200?

A

Mechanical problems in the airways, such as tumors

Obstructive disease

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10
Q

What the definition of a forced expiratory flow 25%-75%

A

Average flowrate during the middle half of a forced expiratory maneuver.

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11
Q

What is the typical value of a FEF 25%-75%

A

4-5 L/sec

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12
Q

What is the significance of

a FEF 25%-75%?

A

Measures flow within the small airways. Decreased with obstructive disease.

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13
Q

What measurement is the most sensitive test to detect the presence of early small airway disease?

A

FEF 25%-75%

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14
Q

When might the FEF 25%-75% may appear erroneously decreased?

A

If the FVC and FEV1 are greatly increased in post-bronchodilator study.

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15
Q

What is an FEVT?

A

Forced Expiratory Volume/Time

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16
Q

What is the definition of an FEV1?

A

Volume of gas expired over 1 second.
(None: FEVT is the same as FEV1. The “T” in FEVT indicates the amount of time in seconds. So FEV 0.5 is FEV in 0.5 seconds.)

17
Q

What is the significance of an FEV1? (x2)

A

Shows decreased flow that could indicate obstructive disease.
Measures degree of improvement after bronchodilator administration

18
Q

How long should you wait before administering a bronchodilator before re-testing the FEV1?

A

10-15 min

19
Q

How do you calculate the FEVT from a graph?

A

Expiratory value at 1 sec - inspiratory value at 2 sec.

20
Q

What is the definition of FEVT/FVC%?

A

The forced expiratory volume for a given time interval expressed as a percentage of (or compared to) the vital capacity.

21
Q

What is the minimum acceptable value for an FEV1/FEC%?

A

70%

22
Q

What is the minimum acceptable value for an FEV3/FEC%?

A

97%

23
Q

What is the significance of an FEVT/FVC%?

A

It’s decreased with obstructive disease and normal with restrictive disease (even in the presence of a decreased VC and/or decreased FEV1)

24
Q

How do you calculate an FEV1/FEC%?

A

Divide the FEV1 by the FEC, then multiply by 100 to get a percentage.

25
Q

What is MVV an abbreviation for?

A

Maximum Voluntary Ventilation

26
Q

What is the definition of an MMV?

A

Largest volume of air inhaled and exhaled over a 12 second (minimum) period.

27
Q

How is an MMV reported?

A

The MMV data is extrapolated to 1 minute and reported in liters per minute, corrected to BTPS.

28
Q

What is a typical MMV value?

A

170 L/min

29
Q

What is the significance of an MMV? (x3)

A

Gives information about:

  1. Compliance of lungs and thorax
  2. Airway resistance
  3. Respiratory muscle status
30
Q

How do you do an MMV?

A

Ask patient to breathe into a spirometer as deeply and rapidly as possible for a minimum of 12 seconds.

31
Q

What is the formula for determining MMV?

A

breaths x volume x 5 x temperature correction factor

32
Q

While performing the MVV with the Collins (water seal) spirometer, the bell should be in the ___ position so the patient can ___ .

A

Mid-position

Inhale and exhale

33
Q

When is the only time that MVV is diagnostically significant?

A

When there are large reductions in values (indicates severe obstructive disease)

34
Q

How do you estimate effort with the MVV?

A

Multiply FEV1 by 35. If MVV is less than that value, suspect poor effort.

35
Q

If MVV is 55% of predicted with a normal FEV1, what shoudl you suspect?

A

That the patient gave a poor effort.

36
Q

If a patient has a low tidal volume and a fast respiratory rate during the MVV procedure, what should you suspect?

A

Restrictive lung disease.

37
Q

The FEV6 is sometimes used as a

surrogate for the ___. Why?

A

FVC.

More reproducible than the FVC and less physically demanding.

Pulmonary Function Testing NBRC (15 decks)

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