Which of the following is (are) used in the measurement of tidal volume on a CareFusion AVEA ventilator?
1. Variable-orifice pneumotachometer
2. Pressure differential pneumotachometer
3. Ultrasonic flow sensor
4. Hot wire flow sensing device
a. 1 only c. 2 and 3
b. 1 and 4 d. 1, 3, and 4
ANS: B
Proximal airway flow sensing with either a variable-orifice pneumotachometer or hot wire flow sensing technology is available for measuring tidal volume at the patient Y connector.
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