11 Ventilation modes 81
fabian +nCPAP evolution | SW V5.1.x
Ref: 122003.EN / Date : 26Jan2021
11.5 PSV
The Pressure Support Ventilation (PSV) option is used to support the pressure of insufficient
spontaneous breathing in Triggered Ventilation modes. 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 milliseconds following a
breath.
Thus, inspiration is controlled by the patient, and occurs according to the parameters set in
Ventilation type SIMV. 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.
(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.
The Inspiratory Pressure for the PSV breath is set using the P
insp
. button.
See Section 10: “Ventilation parameters”
See Section 11.9: “Ventilation Additives”
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.
See Section 10: “Ventilation parameters”
See Section 11.9: “Ventilation Additives”
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