306 Instructions for use | Atlan A300, A300 XL, A350, A350 XL SW 1.0n
Principles of operation
Due to the patient's inspiratory effort or compliance changes in the lungs, the tidal
volume in an individual breath may deviate from the set tidal volume VT. However,
averaged over time a tidal volume corresponding to the set volume VT is applied.
If no mechanical ventilation has previously taken place, a volume-controlled test
breath with constant inspiratory flow is performed first when starting a ventilation
mode with AutoFlow in order to estimate the lung parameters. The inspiratory
pressure required at the start is determined from this test breath. Each additional
breath-related readjustment of the inspiratory pressure is limited to ±3 hPa
(cmH
2O). The pressure difference (inspiratory pressure - PEEP) is at least 5 hPa
(cmH
2O) and the upper inspiratory pressure limit is set by Pmax. If the set value for
VT is reduced, the inspiratory pressure will be reduced by a greater amount if
necessary.
17.2.6.7 VC - CMV / AutoFlow
– Volume-controlled
– Pressure-limited
– Time-controlled
– Machine-triggered
– Decelerating inspiratory flow
The mandatory breaths are machine-triggered and are not triggered by the patient.
17.2.6.8 VC - SIMV / AutoFlow
– Volume-controlled
– Pressure-limited
– Time-controlled
– Machine-triggered or patient-triggered
– Decelerating inspiratory flow
– Synchronized with inspiration and expiration
In VC - SIMV / AutoFlow, the patient can breathe spontaneously at any time, while
the number of mandatory breaths is predefined. When synchronization is switched
on, the breaths are adapted to the spontaneous breathing efforts of the patient. If
spontaneous breathing effort by the patient is detected during the inspiratory trigger
window, a mandatory breath will be initiated. If an exhalation by the patient is
detected during the expiratory trigger window, the expiration will be initiated.
17.2.6.9 VC - SIMV / PS / AutoFlow
This mode is similar to VC - SIMV / AutoFlow, except that the patient's spontaneous
breathing at the PEEP level during the expiratory phase is pressure-supported with
∆Psupp when outside the trigger window.
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