Cardinal Health Alaris 8000 Series, Инструкция по применению

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General Information
3-55 Alaris
®
System Directions for Use
Patient Controlled Analgesia Module Section
Trumpet and Start-Up Curves
In this instrument, as with all infusion systems,
the action of the pumping mechanism and
variations in individual syringes and
administration sets cause short-term
fluctuations in rate accuracy. The following
graphs show typical performance of the system,
as follows:
1. Accuracy during various time periods over
which fluid delivery is measured (trumpet
curves).
2. Delay in onset of fluid flow when infusion
commences (start-up curves).
Trumpet and start-up curves have been
provided for
0.1
mL/h,
1.0
mL/h and
5.0
mL/h.
Measurements for trumpet curve rates above
5.0
mL/h are also not provided, as the volume
of the syringe will be displaced in a very short
time with a rate of up
999
mL/h. Accuracy,
however, is assured with the design
implementation.
Trumpet curves are named for their
characteristic shape. They display discrete
accuracy data averaged over particular time
periods or “observation windows”, not
continuous data versus operating time.
Over long observation windows, short-term
fluctuations have little effect on accuracy, as
represented by the flat part of the curve. As the
observation window is reduced, short-term
fluctuations have greater effect, as represented
by the “mouth” of the trumpet. Knowledge of
system accuracy over various observation
windows may be of interest when certain drugs
are being administered.
Because the clinical impact of short-term
fluctuations on rate accuracy depends on the
half-life of the drug being infused and on the
degree of intravascular integration, the clinical
effect cannot be determined from the trumpet
curves alone. Knowledge of the start-up
characteristics should also be considered.
The start-up curves represent continuous flow
rate versus operating time for two hours from
the start of the infusion. They exhibit the delay
in onset of delivery due to mechanical
compliance and provide a visual representation
of uniformity. Trumpet curves are derived from
the second hour of this data.
Under conditions of -
100
mmHg,
+100
mmHg,
and
+300
mmHg pressures, the PCA Module
typically exhibits a long-term accuracy offset of
approximately
0.2%
or less from the mean
value.