Ventilation modes 97
fabian HFO | SW 5.1.x
Ref: 113003.EN / Date 2020-02-10
11.5 PSV
The Pressure Support Ventilation (PSV) option is used to support
spontaneous breathing. The ventilator provides pressure during the spontaneous inspiration to offset
part of the patient work of breathing. The breathing frequency is determined by the spontaneously
breathing patient, whereas the ventilator assumes an adjustable portion of the breathing effort.
To prevent Auto-Triggering, another breath cannot be triggered for 180 ms following the end of each
breath.
Thus, inspiration is controlled by the patient. However, the ventilator will now control expiration. This
will occur when one of the following criteria is met:
• Airway Pressure exceeds a PPSV pressure Setting
• Inspiratory flow has dropped to the preset fraction 1 to 85% of the maximum inspiratory flow
setting (as preset by the Termination Criteria PSV control)
(indicating a virtually filled lung)
If the patient stops breathing spontaneously the ventilator will assume alternate breathing with the
Ventilation parameter settings.
Apnea Backup Ventilation will start after preset Apnea Time. If this is set to OFF, Backup starts after
E-time.
PSV is only available with active flow sensor measurement. As a result, in case the flow sensor is
deactivated in PSV, the ventilation mode is automatically changed to SIPPV and can be switched
back only manually after the activation of the flow sensor.
The Inspiratory Pressure for the PSV breath is set using the P
insp
. button.
11.6 CPAP
In CPAP Ventilation the patient breathes spontaneously, the ventilator does NOT provide mandatory
breaths. This mode provides a continuous distending positive pressure during inspiration and
expiration in order to splint open the airways and lungs, noticeably reducing the patient’s breathing
effort. The maximum automatic leak compensation is 100% of the Inspiratory Flow.
In the event of an interruption in the patient’s breathing following the default Apnea Period, the
ventilator performs a default number of mechanical breaths to stimulate spontaneous breathing. After
breathing commences, stimulation stops and only commences with the next Apnea event.
CPAP can also be applied in Non-Invasive mode to the patient (Nasal CPAP), using a device with a
15-millimeter adaptor for example: oro- nasopharynx tubes or RAM Cannula; in this case you must
turn OFF the ventilator and remove the flow sensor from the Y-piece of the dual limbed breathing
circuit and connect the proper interface with a 15-millimeter adaptor.
11.7 nCPAP / DUOPAP
In nCPAP / DUOPAP mode the patient breathes spontaneously from a mask or nasal prongs.
A NIV Trigger option can be enabled to provide these modes with breath detection (Apnea
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