The best method for accurately measuring the thoracic gas volume of a patient with emphysema is:
a. helium dilution. c. pressure plethys-mography.
b. nitrogen washout. d. chemiluminescence monitoring.
ANS: C
Inert gas techniques, such as helium dilution and nitrogen washout, can measure gas volumes on-ly in communicating airways. Body plethysmography measures all of the volume in the thorax. Therefore, inert gas measurements of functional residual capacity (FRC) for a patient with chronic obstructive pulmonary disease and severe air trapping will be lower than functional re-sidual capacity measurements obtained during body plethysmography.
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