Select the ventilator flowmeter that will read accurately when used with heliox
a. Turbine
b. Vortex ultrasonic
c. Variable capacitance
d. Variable orifice pneumotachometer
ANS: B
Vortex ultrasonic flowmeters are not affected by the viscosity, density, or temperature of the gas being measured. The turbine and variable orifice pneumotachometer will not be accurate when using heliox because of its decreased density. A variable capacitance device is a transducer used to measure airway pressure.
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