Tafonius
Junior
– A User Guide
using the Assist Mode. The MWPL is set as a high-pressure safety limit the value of
which is continuously compared to the breathing system pressure.
Junior
is a
volume or time cycled ventilator so the MWPL does NOT set how high the pressure
will go but if the pressure should reach the set level the machine will alarm
immediately, terminate the inspiration and switch to the expiratory phase of the
breathing cycle.
ASST
Assist is a mode of ventilation which compares the patient's effort to breathe with a
set value of inspiratory flow. Should the patient reach or exceed that setting an
assisted breath is delivered by the ventilator. Should the patients breathing not be
strong enough to reach or exceed that amount of inspiratory flow within a certain
time the ventilator will give a controlled breath. The value next to the text
ASST
is
the level of inspiratory flow, in liters per minute that must be generated by the patient
to trigger an assisted breath.
CPAP / PEEP
The set CPAP or PEEP pressure setting is displayed in cm H
2
O at the bottom of the
list.
3) Resultant Ventilation values
Area 3 shows the values that result from the settings of the independent variables Tidal
Volume, Respiratory Rate and Inspiratory Time. The dependent variables displayed in this
area are Minute Volume (MV) in liters per minute (lpm), Inspiratory Flow Rate (IF) in lpm, I:E
Ratio and Expiratory Time (ET) in seconds. These are updated whenever a ventilation
parameter is changed. This feature allows the user to see how other parameters are
affected by the change being made. One can therefore “set” a dependent variable. For
example you can set the MV by changing the TV and or the RR and watch the resulting
affect on the MV display. Similarly one could “set” the I:E Ratio by changing the RR and or
the I-time. The I:E ratio display will flash on and off when the settings result in an inverse I:E
ratio, i.e. less that 1:1
4) Patient Ventilator settings & Measured values
Area 4 shows the values set by the operator for Tidal Volume (
TV
), Respiratory Rate (
RR
),
Inspiratory Time (
IT
) and Maximum Working Pressure Limit (
MWPL
) or Trigger sensitivity
level (
SENS
) when assist mode is selected. The values in parentheses above these settings
are the measured values taken during spontaneous breathing.
Tafonius Junior displays information that no other large animal ventilator is able to display.
Take advantage of this information, get use to it, think about it. Especially the Minute
Volume (MV) value. MV is the parameter to observe to quantitatively assess the change in
gas delivery by the ventilator as you change settings. It is this number that must be
changed to raise or lower the PaCO2 all other things being constant. There are many ways
to manipulate this setting. Depending on the pathophysiology of the patient there will be
better ways that other ways to attain the MV delivery desired.
For example in colic cases already high abdominal pressure pose a unique challenge to the
implementation of IPPV. If an increase in MV is required in an attempt to bring the PaCO2
levels down it would be better to increase the RR than the TV. By watching the MV setting it
is much easier to quantify the change your making.
Printed: 26/Oct/18
Page 11 of 20
DOCA4962B
