Author Question: Which of the following control modes of ventilation consists of ventilator output automatically ... (Read 62 times)

CBme · **on:** Jul 16, 2018

Which of the following control modes of ventilation consists of ventilator output automatically following a varying input (e.g., volume or flow generated by the patient)?

a. Servo c. Neural network
b. Optimal d. Knowledge-based

Question 2

Which of the following control modes of ventilation consists of pressure-limited mandatory breaths that can be automatically adjusted between breaths to achieve a preset tidal volume?

a. Servo c. Adaptive
b. Optimal d. Auto-set-point

aprice35067 · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: A
An example of a servo-controlled mode is the proportional assist mode, in which the instantane-ous value of pressure is proportional to the instantaneous volume or flow generated by the pa-tient. The optimal control type has one ventilator set-point automatically adjusted to optimize an-other set-point according to some model of system behavior, and the output can be maximized or minimized dynamically. The artificial neural network is based on acceptable arterial blood gases to maintain patient ventilation (experimental). The knowledge-based control type has set-points that are automatically adjusted according to a rule-based expert system such as end-tidal carbon dioxide.

Answer to Question 2

ANS: C
An example of an adaptive control type is pressure-regulated volume control, in which the man-datory breaths are pressure limited and can be adjusted between breaths to achieve a preset tidal volume chosen by the operator. In the servo-controlled mode, the ventilator output automatically follows a varying input by the patient. In the optimal control type, one ventilator set-point is au-tomatically 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 al-lows the ventilator to select which operator-adjusted set-point to enforce at the moment.