B-8 624074/07
B Modes of ventilation
Because the SIMV modes are mixed modes, with attributes of
both a mandatory and a spontaneous pressure support mode,
the operator must set the parameters specific to the applicable
mandatory mode and to the SPONT mode. For example, when
the P-SIMV mode is selected, the operator must set the param-
eters used in the P-CMV mode as well as in the SPONT mode.
As in all other modes, the operator also sets PEEP/CPAP, Oxy-
gen, and the pressure or flow trigger.
Figure B-3. Breath delivery in SIMV modes
B.3.1 SIMV mode
In the SIMV mode, the mandatory breaths are (S)CMV breaths
(Figure B-4). These can be alternated with SPONT breaths.
The control settings active in the SIMV mode are shown in
Figure B-5.
The SIMV mode guarantees volume delivery. Minute Volume,
a function of tidal volume and breath frequency, is managed
by the mandatory breaths. Simultaneously, this mode helps the
patient gain full control of their breathing pattern allowing
spontaneous breaths and synchronizing those with the manda-
tory breaths.
Because of these characteristics of the SIMV mode, it is chosen
both as a ventilatory support and as a weaning modality.
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