The most commonly used patient-trigger variables include which of the following? 1. Flow 2. Time 3. Pressure 4. Volume
a. 1 and 3 only
b. 2 and 4 only
c. 1 and 4 only
d. 2 and 3 only
ANS: A
The patient trigger variables are flow, pressure, and volume. Time is the ventilator trigger varia-ble. The most common of the three patient triggers are flow and pressure. Very few ventilators use volume as a patient trigger.
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