A pulmonary function technologist can calculate which of the following if values for pH, PaO2, SaO2, SvO2 PvO2, VO2, and Hb are obtained?

When performing quality control in a body plethysmograph using a 5-L isothermal bottle, theVTGat shutter closure are as follows:

A pulmonary function technologist should

During a cardiopulmonary stress test using breath-by-breath gas analysis, a pulmonary function technologist notices that the VO2 suddenly decreases. Which of the following may explain this change?
1. The patient has achieved anaerobic threshold.
2. The measurement of the expired gas volumes is inaccurate.
3. O2 analyzer "phase delay" has increased.
4. There is a leak in the tubing or mouthpiece.

The following test results are available for a 35-year-old subject who is applying for disability:

These findings are consistent with

A pulmonary function technologist is performing an exercise (stress) test on a patient with severe COPD. As the test progresses, the patient shows signs of increasing dyspnea. Measurements of inspiratory capacity decreased from 2.0 L to 1.5 L.
Which of the following most likely occurred?