Pressure Support Ventilation (Psv) - Air Liquide OSIRIS 2 Manual De Uso

Pressure Support Ventilation (PSV)
PSV is a pressure-assisted spontaneous ventilation mode.
A constant positive pressure is maintained in the patient circuit with each inspiratory effort by the patient. The support
flow is generated in order to maintain constant inspiratory pressure.
When the pressure support setting is less than the PEEP, a message appears on the screen. The pressure support
must then be increased.
The inspiratory phase ends when an expiratory effort from the patient is detected, or the TI setting is reached.
FiO in PSV mode depends on the ventilation parameters, resistance, and patient compliance. It remains between 65
2
and 95%.

When switching from PSV mode to VCV/ACMV Air + O2 or VCV/ACMV 100%, the VT setting can be
important. A message 'Adjust VT?' appears on screen with an alarm. If the adjustment is not made within seven seconds,
insufflation is resumed with the displayed VT value, which is based on the previous setting.
 As soon as the patient triggers a respiratory cycle, the message "CYCLE SPONT" is briefly displayed.
 When the respiratory cycle is initiated by the machine, the message "CYCLE CONTROL" is briefly displayed.
Setting the Minimum Respiratory Rate
This is a continuous adjustment, performed by rotating the graduated knob
The frequency can be adjusted from 6 to 40 bpm.

In case of patient inactivity, the device automatically applies pressure-controlled ventilation according to the set
parameters (F min, I/E, etc.).

As stated in the 'expiratory trigger' paragraph, the Fmin setting affects the duration of the refractory period of the
expiratory trigger.
Adjusting the PEEP (Positive End-of-Expiration Pressure)
This adjustment is performed by rotating the graduated knob
The PEEP setting is adjusted continuously from 0 to 15 cmH
Note: A mechanical safety device is placed on this knob to prevent any accidental setting of PEEP > 10 cmH
To set a higher PEEP value, press the metal index pin located beside the knob.
Adjusting the pressure support
This adjustment is performed by rotating the inspiratory flow rate knob
The pressure is adjustable from 3 to 44 cmH
The value appearing on the second line is the pressure setting (PI max = pressure support + PEEP).

When the pressure support setting is less than the PEEP, a message appears on the screen. The pressure support
must then be increased.
Adjusting the other ventilation parameters (inspiratory trigger, I/E ratio, Pmin alarm, Fmax alarm)
Press the MENU key to access each of the settings to be adjusted in turn. The value appears on the first line of the screen:
• Inspiratory trigger threshold (TRIG.);
• I/E ratio (I/E);
• Pmin alarm threshold (Pmin);
• High frequency alarm threshold (Fmax).
Next, adjust the parameter displayed to the desired value using the keys
Confirm by pressing the key. OSIRIS 2 will then take the setting into account.
Repeat the operation for each parameter.

As stated in the 'Expiratory trigger' section, the I/E ratio setting affects the duration of the refractory period of the
expiratory trigger.
Adjusting the Pmax safety setting
This is a continuous adjustment, performed by rotating the graduated knob
Pmax is adjustable from 10 to 80 cmH
The setting is displayed directly on the screen of the device, represented by a vertical line.
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