5.9 SIMV
5.9.1 Functional description SIMV
SIMV is a combination mode where the patient
receives mandatory breaths synchronized with
his breathing efforts and according to the
selected SIMV mode. The patient can breathe
spontaneously with Pressure Support in
between the mandatory breaths.
There are three different SIMV modes,
depending on the modes installed:
• SIMV (Volume Control) + Pressure Support
• SIMV (Pressure Control) + Pressure Support
• SIMV (PRVC) + Pressure Support
The mandatory breath is defined by the basic
settings (as shown in the table below): Minute
Volume/Tidal Volume (depending on
configuration), PC above PEEP, I:E
ratio/Inspiration time (depending on
configuration), Pause time, Inspiratory rise time
and Breath cycle time.
Note: In the Minute Volume configuration
the Tidal Volume is determined by Minute
Volume divided by SIMV rate.
The Breath cycle time is the length of the
mandatory breath in seconds.
For example: A SIMV rate of 6, a breath cycle
time of 3 seconds with an I:E ratio of 1:2
means that the inspiration will take 1 second
and the expiration 2 seconds.
SIMV Period
10 sec
SIMV Cycle
SIMV Period
Spon. Period
37 3
SVX-9010_EN
During the SIMV period, the first triggered
breath will be a mandatory breath. If the
patient has not triggered a breath within the
first 90% of the Breath Cycle time a mandatory
breath will be delivered.
Note: If the ventilator is configured for
setting of Inspiration time, an I:E ratio of 1:2
will be used to estimate the Breath cycle
time.
The spontaneous/pressure supported breaths
are defined by setting the Pressure support
level above PEEP.
78
SERVO-s VENTILATOR SYSTEM V8.0, User's Manual
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| Ventilation, modes and functions |
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