Stephan EVETR, Instructions For Use Manual, Page: 163 / 254

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7 Ventilation modes
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Fritz Stephan GmbH GA-070T-0518V2.7-HAO-EN 163
7.3.3 Spontaneous breathing
CPAP 7.3.3.1
The CPAP ventilation mode requires the full spontaneous breathing of
the patient. The patient can breathe in and out freely at the set CPAP
level. The CPAP level can be set in the »PEEP« field. The inspiratory
and expiratory breathing effort is the sole responsibility of the patient.
The only support provided by the ventilator is rapid compensation of the
patient-inhaled inspiratory flow during pressure-regulated CPAP.
Spontaneous breathing activity can be monitored via the corresponding
trigger signal. If spontaneous breathing stops (apnea), the ventilator
issues an apnea alarm.
CPAP can be combined with backup ventilation. The user can set the
maximum desired apnea duration in the »Apnea« field. If there is no
spontaneous breathing during this time, the ventilator begins mandatory
ventilation using the preset parameters. The parameter settings for backup
ventilation are comparable to PC-SIMV ventilation (see chapter 7.3.2.3).
To return to normal CPAP ventilation, the following criteria must be
fulfilled:

Once backup ventilation starts, the locking time of 3x
(Tinsp + Texp) must be run.

Once the spontaneous breathing activity of the patient has
exceeded the flow trigger threshold (see chapter 7.2), a time
window of 10 s opens. If an additional sufficient spontaneous
breathing takes place during this time window, the respirator
returns to normal CPAP ventilation.
Ventilation mode Adjustable parameters
CPAP  O
2
 PEEP
 Trigger
 Backup
Tab. 37: CPAP