"improving intensive care in Scotland"

Mechanical ventilation

Initial settings



Spontaneous or controlled mode

Pressure or volume controlled

Peak and plateau pressure

Tidal volume

I:E ratio

Tidal Volume (Vt)

During mechanical ventilation, Vt is the volume delivered by the ventilator per breath.


I:E ratio

Inspiratory:Expiratory ratio refers to the ratio of inspiratory time:expiratory time. In normal spontaneous breathing, the expiratory time is about twice as long as the inspiratory time. This gives an I:E ratio of 1:2 and is read "one to two".

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