The therapist is measuring a patient's tidal volume as the patient receives mechanical ventilation. The pneumotachometer being used is a differential pressure flowmeter type incorporated in the system of the mechanical ventilator, which is currently administering 100% O2 to the patient. By what percent will the measurement be in error because of the 100% O2?
A. 5%
B. 12%
C. 16%
D. 21%
?ANS: B
A. Incorrect response: See explanation B.
B. Correct response: Gas viscosity affects the calibration of the Fleisch pneumotachometer when 100% O2 is used. An error of 12% occurs if 100% O2 is used on a differential pressure flowmeter calibrated on room air.
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.
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