Trumpet And Start-Up Curves; Pump Module - CareFusion Alaris 8015 User Manual

In this instrument, as with all infusion systems, the action of the
pumping mechanism and variations in individual administration
sets cause short-term fluctuations in rate accuracy. The
following graphs show typical performance of the system, as
follows:
• Accuracy during various time periods over which fluid
delivery is measured (trumpet curves).
• Delay in onset of fluid flow when infusion commences
(start-up curves).
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 might 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 2 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.
Effects of Pressure Variations
Under conditions of +100 mmHg pressure, the Pump module
typically exhibits a long-term accuracy offset of approximately
-3.5% from mean values.
General Information
2-160

Trumpet and Start-Up Curves

Pump Module

FU
RATE (mL/h)
CHANNEL
SELECT
PAUSE
CHANNEL
OFF
RESTART
Pump and Syringe Modules Section
Alaris System User Manual – with v9.33 Model 8015