80 11 Ventilation modes
fabian +nCPAP evolution | SW V5.1.x
Ref: 122003.EN / Date : 26Jan2021
11.4 SIMV + PSV
In Synchronized Intermittent Mandatory Ventilation + Pressure Support Ventilation (SIMV + PSV)
mode, the patient can initiate a PSV breath in between the mandatory SIMV breaths.
The machine breaths (SIMV) are synchronized with the patient’s breathing pattern. The number
of mechanical breaths per minute is same as the Preset Frequency.
To prevent Auto-Triggering, another breath cannot be triggered for 180 ms following end of each
breath.
If the patient stops spontaneous breathing the ventilator will deliver the mechanical breaths as
set with the Frequency (Rate) button.
Every spontaneous Inspiratory effort of the patient is supported with the Preset Ppsv Pressure
Level. It ends when flow termination criteria are met.
Each SIMV breath can be triggered by the patient.
Between SIMV breaths, the patient can trigger a supportive PSV breath.
• Minimum pressure for the Ppsv is 2 mbar (cmH2O) (trigger breath) / 5 mbar
(cmH
2
O) (untriggered breath) above PEEP.
• Maximum PSV LevelPpsv = Pinsp
NOTE: The PSV support is shown as “Absolute Pressure”.
A triggered breath is
colored Green.
The non-triggered
breaths are Grey.
The Inspiratory Pressure for the PSV breath is set using the Ppsv button.
The PSV breath is terminated at one of the following criteria:
• Airway Pressure exceeds a pressure Setting PPSV
• Inspiratory Flow has dropped to 1 to 85 % of the maximum value of Inspiratory
Flow.
PSV breath is only available with active flow sensor measurement. As a result, in case flow
sensor is deactivated in SIMV+PSV, the ventilation mode is automatically changed to SIMV
and can be switched back only manually after the activation of the flow sensor.
See Section 10: “Ventilation parameters”
See Section 11.9: “Ventilation Additives”
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