Care, Maintenance, and Tests
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E.2.3 Description
During an SIMV breath cycle, mandatory breaths may be initiated and / or occur
during:
1. Assist windows (any breath period).
2. At the end of the assist window when no patient efforts are detected.
Spontaneous / Pressure Support breaths may be initiated and / or occur during
support windows between mandatory breaths.
Figure E-2: Breath Patterns in SIMV Pressure Control and Volume Control Modes
If a patient initiated breath overlaps with the next mandatory breath period, an
Assist window opens and the ventilator either waits for the next patient effort or
delivers the next mandatory breath at the end of the Breath window.
Mandatory breaths terminate when:
1. The set tidal volume is delivered.
2. The pressure limit is reached.
3. The I:E ratio reaches 1:1 when an inverse ratio is not manually set.
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