During a helium dilution test for functional residual capacity, you notice that it takes 19 min for equilibration between the gas concentrations in the spirometer and the patient's lungs. Based on this information, what can you conclude?
a. The patient has restrictive lung disease.
b. The spirometer is leaking helium.
c. The patient has obstructive lung disease.
d. Insufficient oxygen was added to the system.
ANS: C
Patients with obstructive lung disease may require up to 20 min to equilibrate because of slow gas mixing in the lungs.
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