Which of the following ventilator control systems are considered closed loop? 1. Orientation based 2. Servo 3. Adaptive 4. Optimal
a. 1 and 3 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 2, 3, and 4 only
ANS: D
The basic concept of closed-loop control has evolved into at least seven different ventilator con-trol systems.
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