Page 21 of 292
2.5 SIMV (Synchronized Intermittent Mandatory Ventilation)
The frequency of mandatory breaths is determined by the BPM control. When a mandatory
breath is due an assist window opens and waits for a patient's inspiratory effort. When this
occurs the ventilator delivers a synchronised breath (SIMV breaths). Once the breath has
been delivered the assist window closes until the next set breath is due.
If the ventilator does not see a patient's attempt to breathe before the end of the defined time
window then a mandatory breath is delivered. The mandatory breath point is the Time
Window minus the Inspiratory Time.
User sets the following:-
•BPM
• Apnoea time (Only if backup breath rate is 19 breaths per minute or lower)
• Positive End Expired Pressure (PEEP)
• Peak Inspiratory Pressure (PIP)
• Inspiratory Time (Ti)
•Fi0
2
• Flow breath detection threshold (Set Trigger) - The patient effort required to satisfy
the apnoea alarm.
• High and low pressure alarm thresholds
• Tidal volume, high and low alarm thresholds
• Minute volume, high and low alarm thresholds
Assist windows
Time windows
60
BPM
Time window =
Inspiratory time
Mandatory breath point
To Next Page
Loading...
