Advanced Ventilation (optional)

Pressure Support of spontaneous breathing

Intended use:

Anesthesia in spontaneously breathing patients with laryngeal masks during surgeries without muscle relaxants.

Pressure support for spontaneous breathing can be used in all mechanical ventilation modes. At the same time, this option is an independent ventilation mode.

The patient's spontaneous breathing effort is supported by the following factors:

– The flow trigger sensitivity controls the synchronization.

– The adjusted pressure setting is a measure of the pressure support.

The curve's rate of rise can be preset with the slope increase time "Tslope".

In addition, an apnea ventilation can be set via the minimum frequency "Freqmin".

If the patient does not breathe spontaneously, the ventilator is activated automatically dependent on the set minimum frequency "Freqmin". The subsequent ventilation breath is not a mandatory ventilation breath. The patient can always stop the mandatory ventilation breath by his/her own breathing activity.

ΔPPS = 0, 1, 2 hPa adjustable in Pressure Support mode.

At same time, min. frequency is deactivated (and re-activated when increasing ΔPPS above 2 hPa).

With each breath of the patient the set CPAP value is maintained.

Synchronization of controlled ventilation and Pressure Support of spontaneous breathing

Pressure support is activated if, during controlled ventilation, a value is entered for the level of the pressure support "Δpps".

The message "PressSupp" is displayed in the ventilation mode status field on the screen. The flow trigger sensitivity and the "Δpps" level control the synchronization or the pressure support.

The maximum time delay between the controlled ventilation breaths is adjusted by means of the frequency. To keep the frequency constant in the event of a premature triggering, the time is equalized in the next cycle.

If, at the time of pressure support activation, the patient was being ventilated without synchronization, automatic activation of the synchronization is initiated with the last trigger setting used.

If pressure support is deactivated with "OFF", the synchronization is maintained with the set value. If the trigger is deactivated with "OFF", then the pressure support will be deactivated automatically.