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1. Which of the following directly describes the measurement of FRC by the closed circuit method
I. The system volume of spirometer and circuitry must be calculated
II. The test is continued until the He changes by less than 2% in 30 seconds
III. A small amount of He is absorbed by the blood and tissues
IV. A CO2 absorber is required

I, III, IV
I. The system volume of spirometer and circuitry must be calculated
III. A small amount of He is absorbed by the blood and tissues
IV. A CO2 absorber is required

2. A subject has the following lung volumes measured using a body plethysmograph
Measured Predicted
VC 4.91 5.20
FRC 4.66 3.90
RV 3.80 2.10
TLC 8.71 7.30
These values are consistent with which of the following?

An obstructive pattern such as emphysema

3. Which of the following combinations are characteristics of a restrictive pattern

Reduced VC, reduced TLC, Normal RV/ TLC

4. To measure accurately the VTG, the patient should be instructed to do which of the following?

Pant about once per second

5. The following data are obtained from spirometry and a He dilution FRC test (all values have been corrected to BTPS):
VC 3.4 L
IC 2.1 L
ERV 1.3 L
FRC 3.9L
What is the patient's RV/TLC ratio?

43%

6. A subject has the following test results from spirometry and N2 washout FRC determination:
Measured Predicted % Predicted
VC 4.60 4.7 98
FRC 8.2 3.8 216
TLC 10.2 7.5 136
RV/ TLC % 55 37
Which best explains these findings?

A leak occurred during the FRC test

7. The reported value for VTG should be:

Averaged from 3 acceptable maneuvers

8. A subject has the following measurements obtained during pulmonary function testing
FVC 3.90 L
FEV1 1.10 L
FRC (He) 3.62 L
VTG 4.77 L
These findings are consistant with:

Severe obstruction with air trapping

9. During an SBN2 test, an increased slope of phase III is:

Indicative of uneven distribution of gas within the lungs

10. Which of the following correctly describes the measurement of FRC by the open circuit method?
I. Alveolar N2 is assumed to be 65% at the beginning of the test
II. The test is continued until alveolar N2 is reduced to 1%
III. Some N2 is released from the blood and tissues
IV. A fast response CO2 analyzer is required

II & III
II. The test is continued until alveolar N2 is reduced to 1%
III. Some N2 is released from the blood and tissues

11. A subject has these lung volumes measured using a body plethymograph:
Measured Predicted
VC 4.4 4.4
FRC 3.9 3.7
RV 2.2 2.1
TLC 6.3 6.5
These values are consistent with:

Normal lung volume

12. A patient with emphysema has his FRC measured with the closed-circuit method and plethysmography. He produces the following results:
FRC (He dilution) 4.1 L
VTG 4.6 L
FRC (predicted) 3.6 L
Which of the following best explains these results?

This is a normal pattern for the patient's diagnosis.

13. Which of the following are characteristic of obstructive lung disease when measured values are compared with predicted noramls?
I. VC is increased
II. FRC is increased
III. RV is increased
IV. RV/TLC ratio is increased

II, III and IV
II. FRC is increased
III. RV is increased
IV. RV/TLC ratio is increased

14. To begin to measure FRC in a body plethysmograpgh, the VTG should be measured by:

Closing the shutter at end-expiration

15. The following raw data are obtained from spirometry and an He-dilution FRC test (all values have been corrected to BTPS):
VC 3.4 L
IC 2.1 L
ERV 1.3 L
FRC 3.9 L
What is the patient's RV?

2.6 L (BTPS)

16. The following raw data are obtained from spirometry and an He-dilution FRC test (all values have been corrected to BTPS):
VC 3.4 L
IC 2.1 L
ERV 1.3 L
FRC 3.9 L
What is the patient's TLC?

6.0 L (BTPS)

17. Alveolar pressure is measured in the body plethysmography by:

Recording mouth pressure when the shutter is closed.

18. In addition to a spirometer, which of the following pieces of equipment are needed to perform a closed-circuit FRC determination?
I. CO2 and H2O absorbers
II. An O2 source
III. An He analyzer
IV. An N2 analyzer

I, II, and III
I. CO2 and H2O absorbers
II. An O2 source
III. An He analyzer

19. Which of the following are true when comparing dilutional lung volumes with body plethysmography in subjects who have severe obstruction?

He rebreathing underestimates TLC

20. The following FRCpleth values are obtained with a body plethygraph:
Maneuver 1: 2.35 L
Maneuver 2: 2.30 L
Maneuver 3: 2.15 L
According to the ATS/ERS standards, what should the technologist's next step be?

Perform another maneuver (At least 3 FRCpleth values must fall within 5% of their mean)

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