Penlon AV-S, Service Manual, Page: 31 / 94

3.7.5.2 SMMV
Synchronised Mandatory
Minute Ventilation
Guarantees a set level of minute
volume ventilation. SMMV allows
spontaneous breaths, combined with a
synchronised mandatory breath, to
achieve the set minute volume
SMMV -
Spontaneously Breathing Patient
Inspiratory flow in the Trigger Window
(generated by the patient’s
spontaneous breath) results in a
synchronised mandatory breath,
ensuring that the set minute volume is
achieved
SMMV -
No breathing effort by Patient
If the patient makes no effort to breathe
during a cycle, a mandatory breath, at
the end of the trigger window, will still
be delivered at the preset volume and
rate
SMMV - Selection
Select Standby Mode
Select Menu
Select Special Modes
Select SMMV
SMMV is now on the main screen in
Spontaneous mode.
NOTE
1.
SMMV is triggered by flow when
Spirometry is active.
SMMV is triggered by pressure
If Spirometry is disabled.
2. The trigger window is pre-set to
60% of the BPM cycle time.
3. The trigger pressure is PEEP
referenced
4. If the pressure limit and alarm are
activated the inspiratory phase is
terminated.
SMMV Default Settings
The ventilator will default to the settings
shown in the table, after selecting
'SMMV'.
Note that Vm can be adjusted before
SMMV is confirmed.
Trigger setting defaults to 0.4 litres/min,
and is adjustable between 0.2 and 1.0
litres/min.
25
DESCRIPTION
Default Settings - SMMV
Adult Paediatric Overall range
Vm 3.6 L 2 L As Volume Mode
BPM 6 10 As Volume Mode
Insp. (Ti) 2 1 I:E display box
Trigger level 0.4 L/min 0.4 L/min 0.2 to 1.0 L/min
PEEP
0 cmH
2
O
Pmax
A
SMMV - Spontaneously Breathing Patient
A = Cycle Time (set from BPM)
B = Trigger Window
C = Spontaneous Breath
D = Trigger
E = Vt of Mandatory Breath is equal to Vm / BPM minus the volume
spontaneously breathed during the cycle (maintaining the set Vm)
A
B B
C
D
E
PEEP
0 cmH
2
O
Pmax
A
SMMV - No breathing effort by Patient
A = Cycle Time (set from BPM)
B = Trigger Window
C = Flat Pressure Trace (no breathing effort)
D = Mandatory breath at the end of the Trigger Window at the set Vm
A
B B
C
D