Which of the following ventilator control types consists of the output of the ventilator automati-cally matching a constant operator-preset input value?
a. Optimal c. Auto-set-point
b. Set-point d. Knowledge-based
ANS: B
A set-point control-type example mode is available in volume-controlled intermittent volume ventilation; in this mode, mandatory breaths are volume limited and volume cycled for the tidal volume setting. Optimal control has one ventilator set-point automatically adjusted to optimize another set-point according to some model of system behavior, and the output can be maximized or minimized dynamically. The auto-set-point control type enables the ventilator to select which operator-adjusted set-points are enforced at the moment. The knowledge-based control type has set-points that are automatically adjusted according to a rule-based expert system.
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