What type of breath occurs when the ventilator controls the timing, tidal volume, or inspiratory pressure?
a. Assisted
b. Mandatory
c. Spontaneous
d. Controlled
ANS: B
Mandatory breaths occur when the ventilator is time triggered, volume or pressure targeted. Spontaneous breaths are patient triggered, and the volume or pressure is based on the patient's demand and lung characteristics. Assisted breaths have characteristics of both mandatory and spontaneous, the patient triggers the breath, the ventilator delivers a set pressure or volume, and the airway pressure rises above baseline during inspiration. The term control is not used to de-scribe the type of breath delivery. This term is used to describe the variable that is being manipu-lated as the target for the breaths (e.g., pressure control or volume control).
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