Minute Volume cont.
There are two ways to change the
Minute Volume
per Kilogram number:
a.
Since the
Minute Volume
number is directly proportional to
Breaths Per
Minute
, the most direct way to change the
Minute Volume
number is to change
the number of
Breaths Per Minute
.
b.
Changing the
Peak Inspiratory Pressure
(
P.I.P.
) will change the
Tidal Volume
and therefore change
Minute Volume
number as well. Obese patients with low
thoracic compliance and patients with restrictive lung conditions will often need
a higher
Peak Inspiratory Pressure
. The best method is to observe the “rise
and fall” of the chest and adjust the
Peak Inspiratory Pressure
for a
"reasonable" amount of filling.
THE PEAK INSPIRATORY PRESSURE GRAPH
1.
The
Peak Inspiratory Pressure
of the patient is indicated by a cursor moving
across the middle of the LCD display.
2. The cursor starts at 0 cm. of H
2
O and moves up to the selected
Peak
Inspiratory Pressure.
3. A square
BLACK
cursor moving across a
WHITE
background indicates that the
breath was initiated by the ADS 2000. Whereas a square
WHITE
cursor moving
across a
BLACK
background indicates that the patient initiated the breath, (
ASSIST
MODE
).
THE INSPIRATORY TIME
1. The information in the upper right hand corner of the display shows the
Inspiratory
Time
in seconds, e.g., 1.20 and is
updated with each breath
. The exact
length of inspiration is not critical, but it should allow an
INSPIRATORY:
EXPIRATORY RATIO
of at least 1:2. This means at 10 B
reaths Per Minute
, the
inspiratory time should be no longer than two seconds. Generally, intervals of 0.75 to
2 seconds are suggested, the shorter time intervals being best for smaller patients.
2. The easiest way to adjust the
Inspiratory Time
is to adjust the
Flow Rate
, i.e. the
higher the F
low Rate
the quicker the lungs will be brought up to the preset
Peak
Inspiratory Pressure
, thus a quicker
Inspiratory Time
. Generally set the
Flow Rate
so
that the patient's chest rises in a reasonable time.
IMPORTANT: Very short
Inspiratory Times
may indicate a very high
Flow Rate
into
a very small patient. Under these circumstances, the narrowness of the tube and the
resistance of the trachea and other air passageways will cause the pressure to build
up without inflating the lungs. It is usually very obvious when this occurs because the
pressure will rise extremely rapidly
,
but the chest will not fill
.
DO NOT LET THIS
CONDITION GO UNCORRECTED
. Lower the
FLOW RATE
to 2 or 4 LPM and let the
chest fill more slowly.
16
Engler Engineering Corporation
ADS2000
Summary of Contents for ADS 2000
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