Table of Contents - Covidien

Breath delivery
T m
PIM SPONT
T s extension
Figure D-4. Spontaneous breaths during SIMV
The ventilator remains in T s until T b has elapsed, then reenters T m .
If the patient does not trigger a breath during T m , the ventilator
delivers a VIM breath when T m has elapsed (Figure D-5).
NOTE:
To prevent “breath stacking” in SIMV mode, the ventilator will
not deliver the next VIM breath to maintain the breath rate
until the flow drops to 50% of the peak inspiratory flow and
at least 200 ms of the expiratory phase have elapsed.
Figure D-5. Mandatory breaths during SIMV
The ventilator can deliver an OIM (manual inspiration) during T m or
T s (Figure D-6). If the ventilator delivers an OIM during T s , the SIMV
breath timing is unaffected. If the ventilator delivers an OIM during
T m , T m terminates and the ventilator enters T s .
Figure D-6. Manual inspiration during SIMV
D-6 10066984 Rev. D 700 Series Ventilator Operator’s Manual
T s
7-00082
VIM VIM
Tm Ts Tm Ts VIM PIM OIM OIM
T m T s T m
T s
T s extension
T m
T s
T s extension
7-00083
7-00084