Topic Progress:

Expiration occurs passively because of the elastic recoil of the lung.

The only feature controlled in expiration is the baseline pressure or positive end expiratory pressure (PEEP).

Paw mbar 20 10 10

Paw mbar 20 10 10

I:E is the ratio of the set inspiratory time (Ti) to the expiratory time (TE).

between 1:2 and 1:3 and mimics a natural breathing pattern

o Not truly a controlled feature of expiration since it is the Ti that is set

           § Ti is set on the ventilator in seconds

           § The rest of the breath is therefore expiration

           § Example 10 breaths per minute gives 6 seconds per breath

                          § Ti set at 1.5s

                          § Expiratory time is 4.5s

                          § I : E = 1 : 3

o This can be altered for specific conditions for example

            § Longer Ti is used in hypoxia

            § Longer TE is used in obstructive lung disease to prevent gas trapping 

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