Synchronized Intermittent Mandatory Ventilation (SIMV)
In SIMV, mandatory and spontaneous breaths may be
delivered to the patient. The user may choose to Pressure
Control, Volume Control, or Volume Target Pressure Control*
the mandatory breaths. Mandatory breaths may be time
(ventilator-triggered) or patient-triggered. In Volume or
Pressure Control, the user may choose to pressure support the
spontaneous breaths.
In Volume Target Pressure Control*, all spontaneous breaths
are Volume Target Pressure Support breaths.
The Respiratory Rate setting determines the total number of
mandatory breaths delivered each minute. The Respiratory
Rate setting also establishes a timing window that determines
whether a patient trigger results in a mandatory breath or a
spontaneous breath.
The Trig setting determines the airway pressure or airway flow
threshold that the patient’s effort must reach in order to trigger
mandatory breaths and also to trigger spontaneous breaths in
between mandatory breaths.
If there are no patient breathing efforts or if patient efforts fail
to cause enough airway pressure or airway flow change to
meet the set Trig threshold, the patient receives the number of
time-triggered breaths each minute selected via the
Respiratory Rate setting.
Spontaneous (SPONT)
In SPONT
, all breaths delivered to the patient are spontaneous
breaths. When Volume Control or Pressure Control breath
types are selected, the user may choose to add Pressure
Support to assist spontaneous efforts. When Volume Target
Pressure Control* breath type is selected, all spontaneous
ef
forts are assisted by V
olume Target Pressure Support. The
Trig setting determines the airway pressure or airway flow
threshold that the patient’s effort must reach in order to trigger
spontaneous breathing assistance from the ventilator
. If there
are no patient efforts or if the patient efforts fail to cause
enough airway pressure or airway flow change to meet the set
Trig threshold, no spontaneous breathing assistance is
provided.
Spontaneous Breath Management In SIMV and SPONT Modes
There are two forms of spontaneous breath assistance on the
e360 ventilator:
• Pressure Support
•
V
olume
T
arget Pressure Support
A-4 SER360 A1106
THEORY OF OPERATION
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