Instructions for use | Atlan A100 (XL), A300 (XL), A350 (XL) SW 2.1n 309
Principles of operation
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 With pressure support
PC - SIMV PC - SIMV / PS
VC - SIMV VC - SIMV / PS
VC - SIMV / AutoFlow VC - SIMV / PS / AutoFlow
CPAP / PSV 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.
Ti
1)
Inspiratory time
I:E
1)
Ratio of inspiratory time to expiratory time
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:
Pressure-controlled Volume-controlled
SIMV PC - SIMV VC - SIMV
CMV PC - CMV VC - 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
2 Oxygen concentration in the fresh gas (only with electronically controlled gas
mixer)
FG flow Fresh-gas flow (only with electronically controlled gas mixer)
Air / N
2O Carrier gas Air or N2O (only with electronically controlled gas mixer)
1) Whether the ventilation settings are based on Ti or the I:E ratio can be defined in the system setup.
Therapy
controls
Meaning / Function
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