Increasing the bias flow on the CareFusion 3100A High-frequency Oscillatory Ventilator would cause which of the following to occur?
a. Decrease in ampli-tude c. Increase in mean airway pressure
b. Increase in percent inspiratory time d. Automatic center-ing of piston
ANS: C
Changes to the bias flow can increase mean airway pressure. A limit to how much mean airway pressure can develop in the system is controlled by the mean pressure limit control knob. This control is used to protect the patient from inadvertent increases in mean airway pressure caused by changes in bias flow, percent inspiratory time, or frequency.
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