__________ _____ is commonly used to remove water vapor. what is also used to establish water vapor content?
anhydrous CaSO4; selectively permeable tubing
DLCO may be helpful in evaluating disorders such as ____________ syndrome.
hepatopulmonary
what is used instead of a reservoir bag for the test gas? what should the maximal inspiratory pressure to maintain flow at 6 L/sec be in a demand-flow system?
demand valve; <10 cmH2O
to obtain an alveolar sample, _____ _____ gas needs to be washed out. what is usually a sufficient washout time? what about with small VCs?
dead space; 0.75-1.0 L; 0.5 L
what does the pt do during this method?
exhales slowly and evenly at approximately 0.5L/sec from TLC to RV
in the presence of normal amounts of Hb and normal ventilatory function, what is the primary limiting factor to diffusion of CO?
status of the alveolocapillary membranes
what should anatomic dead space be calculated as?
2.2 mL/kg IBW
what is one advantage of multi-gas analysis?
CO and CH4 (methane) are measured rapidly and continuously
healthy subjects and pts with airway obstruction should be able to inspire at least ___% of their VC within __ seconds.
85%; 4
____ is used as the tracer gas because it can be rapidly measured using an infrared analyzer.
