8500 Ventilator
Training Manual
So 735 ml is the actual ventilator output into the breathing circuit to give 500 mL at the
catheter mount.
This figure would have to be recalculated in the light of any fresh gas flow change as
above but would just be a variation on the 735 ml figure.
Pressure Control ventilation (PCV)
Pressure control ventilation is a time cycled mode where the ventilator strives to produce
the user set inspiration pressure for the inspiratory period. To accomplish this goal, the in-
spiratory flow rate and pressure are set by the user. To do this, the control that is used for
the Set TV function will be reasigned as “I Flow” and calibrated in LPM. The pressure
Limit control becomes the “Set Pressure” control. This allows the user to define the deliv-
ered wave form. The default pressure will be 30 cmH
2
O in both Adult and Paediatric
modes.
Inspiratory Pause
A function that is “Inspiratory Pause” is to be implemented. This option will be available in
volume and PCV mode such that a pause of 25% of the inspiratory time is used as a Pla-
teau before starting the expiratory phase. This means the expiratory time is reduced by
the plateau time. If at all possible the pause or plateau time should be made variable from
5 to 60 %. The x % should be displayed on the second row up of the display.
Sigh
Sigh is a function that can be selected in volume or Pressure ventilation the effect is that
every 50 breaths the delivered breath is increased by 15 %. The selection of this function
will be displayed as an extension to the main mode display under the bar graph.
Spontaneous or PSV
Spontaneous is a mode that is equivalent to the machine being in standby with all moni-
toring enabled. This allows a patient to breath at their own rate and volume with the venti-
lator being able to display the monitored parameters and actuate alarms. At this level the
Breathing rate would be a monitored parameter, it should follow the same pattern as other
features in that it will display the monitored value in large characters and show Pressure
Support Ventilation “PSV” as the mode.
Pressure Support
When a patient is taking a “Spontaneous Breath” from an anaesthetic system the work of
breathing is higher than normal. To overcome this it is desirable for the ventilator to be
able to assist the spontaneous breath. The assistance is provided by the ventilator sens-
ing the negative pressure caused by the “Patient Attempt” to breath and initiating flow
from the ventilator. This flow is continued to the point where the breathing circuit pressure
has reached a set value. ie. Pressure Support. To implement this action the user needs
to be able to set first the trigger threshold in the range -1 to -10 cmH
2
O and secondly the
Support Pressure 0 to 30 cmH
2
O both referenced to the PEEP level.
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