Trumpet And Start-Up Curves; Introduction - Cardinal Health Alaris Directions For Use Manual

Pump and Syringe Modules
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 vari ous
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 be ing 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 hours from the start of the infusion.
2
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.
2-108
General Information

Trumpet and Start-Up Curves

Introduction

FU
FU
RATE (mL/h)
RATE (mL/h)
CHANNEL
SELECT
CHANNEL
SELECT
PAUSE
PAUSE
CHANNEL
OFF
CHANNEL
OFF
RESTART
RESTART
Alaris
Pump and Syringe Modules Section
® System (with v9 Model 8000) DFU