Dräger Babylog 8000 plus Instructions For Use Manual page 159

Synchronized Intermittent Mandatory
Ventilation (SIMV)
Paw
Pinsp
PEEP
TI
Flow
The SIMV ventilation mode combines
synchronized ventilation with spontaneous
breathing. In contrast to the SIPPV ventilation
mode, not every spontaneous inspiration is
supported, but rather only as many as necessary
for the patient to breath at the set respiratory rate.
Between mechanical breaths, the patient can
breath spontaneously, but the device does not
support breathing.
In an interval with the length of T
spontaneous inspiration triggers a mechanical
breath with the length of T
breathing until the end of the interval is ignored.
The mechanical breaths thus display the irregular
rhythm of spontaneous breathing but, averaged
over time, correspond to the set respiratory rate.
Breaths are triggered in the same way as in the
SIPPV ventilation mode.
The shape of the mechanical breath is set in the
same way as in the IPPV/IMV ventilation mode.
In the SIMV ventilation mode, the respiratory rate
can be set in the same way as in the IPPV/IMV
ventilation mode. Triggered mandatory breaths
alternate with spontaneous breathing phases
without support in which the patient must exert the
entire work of breathing alone. By increasing T
Instructions for use Babylog 8000 plus SW 5.n
t
+ T , each initial
I E
. Further spontaneous
I
E
gradually increasing fraction of the whole work of
breathing can be shifted from the ventilator to the
patient.
When the patient no longer triggers mechanical
breaths, ventilation begins as in the IPPV/IMV
ventilation mode.
The SIMV ventilation mode is appropriate for
patients with sufficient spontaneous breathing. The
patient can be weaned by gradually increasing T
and reducing the inspiratory pressure.
t
a
Principles of operation
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159