FREQUENTLY ASKED QUESTIONS
Q. The Flow Rate indicated on my LCD readout seems to be a very high number,
in my rebreathing system I never used flow rates like 32 or 44 liters per minute, is
this normal?
A. Absolutely, the LCD readout on the ADS 2000 gives the Flow Rate if the unit were
left on for an Inspiratory Time of 60 seconds. An example would be as follows; say the
ADS 2000 was set to 24 LPM and we let the unit have an inspiratory time of 1 minute,
then 24 liters of gas would have been used. In reality, the ADS 2000 only allows gas to
flow when a breath is delivered for whatever the Inspiratory Time is. In order to
determine the "Actual Flow Rate" a simple calculation can be performed. This
calculation is as follows:
F
ave. = (
F
insx
T
on x
B
) / 60
Where:
F
ave.= Actual Flow Rate
F
ins.= Flow Rate on LCD Display
T
on=
Inspiratory Time
B
= Actual Breaths Per Minute
Q. How does the ADS 2000 calculate the Minute Volume per Kilogram?
A. The formula for calculating minute volume is:
M
v
=(T
v
x
B) / W
Where: M
v
= Minute Volume per Kilogram Tv
= Tidal Volume
B = Breaths Per Minute W
= Weight in Kilograms
The ADS has a microprocessor, which determines this number and updates the
display after each inspiration has ended.
Q. What is proper value for the Minute Volume per Kilogram number?
A. A properly ventilated patient should require from 150 to 250 ml. / minute / Kg. The
150 ml. / minute / Kg. number is appropriate for larger patients and the 250 ml. / minute /
Kg. number for smaller patients.
Q. How do I add additional anesthesia liquid to my vaporizer during a
procedure?
To fill the vaporizer during a procedure, place the SET / RUN switch to "SET", wait
for the ADS 2000 to complete the last breath cycle. Fill the vaporizer as usual, then
switch back to "RUN" to continue.
34 Engler Engineering Corporation ADS 2000
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