During assist-control ventilation with flow as the control variable, identify the variable responsible for cycling
A. time
B. pressure
C. volume
D. flow
?ANS: C
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: The cycle variable is the variable responsible for the termination of inspiration. During assist-control ventilation, the control variable is flow, and when the preset volume is reached, the ventilation cycles, that is, inspirations ends and expiration begins. The variable for terminating inspiration in this instance for volume-control ventilation is volume. Therefore volume is the cycle variable.
D. Incorrect response: See explanation C.
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