The most common method of terminating inspiration during pressure support ventilation is which of the following?
a. Flow
b. Time
c. Pressure
d. Volume
ANS: A
During pressure support ventilation, when a breath is delivered, the flow will begin to taper down after a very short period of time. When flow drops to a certain percentage of the initial peak flow the ventilator flow cycles out of inspiration. A time cycled breath is usually a breath that is con-trolled by the ventilator during pressure control ventilation. Pressure cycling is used for intermit-tent positive pressure breathing (Bird Mark 7). Volume cycling is utilized during ventilator breaths on certain ventilators.
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