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Therapy
Meaning / Function
controls
Insp term
When the flow falls below this flow value (in % of the measured peak flow), a sup-
ported breath is interrupted.
PEEP
Positive end-expiratory pressure
Pressure that is always maintained.
∆Psupp
Pressure difference of an assisted breath between PEEP level and inspiratory
pressure
This pressure support is only available if synchronization of spontaneous breath-
ing (SIMV and in PSV mode) is switched on.
When pressure support is switched on, the naming of the following ventilation
modes changes:
Without pressure support
PC - SIMV
VC - SIMV
VC - SIMV / AutoFlow
CPAP / PSV
Pinsp
Inspiratory pressure
Pmax
Upper pressure limit in volume-controlled ventilation. When this pressure is
reached, the breath is held at this level until the set inspiratory time Ti is reached.
Trigger
Flow that, when exceeded, triggers a supported breath.
Inspiratory time
1)
Ti
Ratio of inspiratory time to expiratory time
1)
I:E
Slope
Period of time during which a pressure rise from the PEEP or CPAP pressure to
the inspiratory pressure or PSV pressure takes place. This time determines the
steepness of the rise in pressure from the lower to the upper level.
VT
Tidal volume
SIMV/CMV
Switching spontaneous breathing support on/off
Switching the synchronization on or off causes the following change to the ventila-
tion mode:
SIMV
CMV
When synchronization is switched on, mandatory breaths are synchronized with
the patient's inspiratory effort. In doing so, the respiratory rate RR is held constant
by adapting the mandatory breaths and the expiratory time. At the end of the expi-
ratory phase, an inspiratory trigger window is activated so that the mandatory
breath can be initiated prematurely by up to 5 seconds (patient category Adult) or
1.5 seconds (patient categories Ped and Neo). If the spontaneous inspiratory flow
reaches the set value of the flow trigger Trigger during this trigger window, a pre-
mature mandatory breath is triggered.
If no spontaneous breathing is detected within the inspiratory trigger window, a
mandatory breath will be triggered immediately afterwards.
FG O
Oxygen concentration in the fresh gas (only with electronically controlled gas
2
mixer)
FG flow
Fresh-gas flow (only with electronically controlled gas mixer)
Air / N
O
Carrier gas Air or N
2
1) Whether the ventilation settings are based on Ti or the I:E ratio can be defined in the system setup.
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Instructions for use
Atlan A100 (XL), A300 (XL), A350 (XL) SW 2.1n
Pressure-controlled
PC - SIMV
PC - CMV
O (only with electronically controlled gas mixer)
2
Principles of operation
With pressure support
PC - SIMV / PS
VC - SIMV / PS
VC - SIMV / PS / AutoFlow
CPAP / PSV
Volume-controlled
VC - SIMV
VC - CMV
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