Trumpet And Flow Rate - VET-PRO VIP 2000 Operator's Manual

Trumpet and Flow Rate

In VET-PRO, as with all infusion systems, the action of the pumping
mechanism and variations cause short – term fluctuations in rate accuracy.
The following curves show typical performance of the system in two ways:
1. The accuracy of fluid delivery over various time periods is measured
(Trumpet curves).
2. The delay in onset of fluid flow when infusion commences (Start up
curves).
Trumpet curves are named for their characteristic shape. They display discrete
data averaged over particular time periods or
continuous data versus operating time. Over long observation windows, short-
term fluctuation has little effect on accuracy as represented by the flat part of
the curve. As the observation window is reduced, short-term fluctuations have
greater effects 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. Short term fluctuations in
rate accuracy may have clinical impact depending on the shelf-life of the drug
being infused and the degree of intravascular integration, the clinical effect
cannot be determined from the trumpet curves alone.
The Start-up curves represent continuous flow 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.
Tests performed according to IEC 601-2-24 standard.
10
"Observation windows", not
VET-PRO Operator's Manual