The mandatory breath begins as a pressure-controlled breath, but it switches to volume control during inspiration because a preset volume is not achieved. This describes which of the following control types?
a. Set-point c. Auto-set-point
b. Adaptive d. Knowledge-based
ANS: C
In this example, inspiration is starting out in pressure control and then switches to volume control by using operator-adjusted set-points. One type of mode that fits this category of control types is pressure augmentation (BEAR 1000). In the set-point control type, the output of the ventilator automatically matches a constant operator-preset input value. The adaptive control type changes set-point types based on the patient's changing condition. The knowledge-based control type has the set-points automatically adjusted according to a rule-based expert system, such as breathing frequency, tidal volume, and end-tidal carbon dioxide levels.
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