LSUHSC Shreveport
Radiology Department
Proc 13.17
contrast
media/heated).
* A larger gauge catheter is
being used.
* Fewer disposables in the
fluid path (lack
of extension tube, stopcock,
checkvalve,
IV extension set).
Condition #3
The graph and injection
start out normal, but
level off to a less than
expected peak pressure.
An inappropriate pressure
limit may be selected. If a
lower pressure is selected
than what is required to
deliver the flow rate, the
injection will start out
normally for the first few
seconds. However, as soon
as the pressure limit value is
achieved, the flow rate will
automatically decrease to
keep the system from
exceeding the selected
pressure limit.
Check to see if the Pressure
Graph is approaching the
dotted horizontal line
(pressure limit setting). If it
is, the injector is pressure
limiting and causing this
condition. See Pressure
Limiting” in the Operation
Manual for a thorough
discussion of causes and
resolution.
Note: Medrad makes no claims about the information on the Pressure Monitor Graph
other than it is a graphic representation of the force required to move the syringe plunger,
which closely approximates the pressure developed in the syringe.
CONDITION# DESCRIPTION
POSSIBLE CAUSES
POSSIBLE ACTIONS
Condition #4
At the start of the
injection, the
Pressure Garph
signal
immediately
rises straight up
and hits the
pressure limit
setting (dotted
horizontal line).
The fluid path may be
occluded (after reaching a
“High Pressure Disarm”.
Stellant will automatically
terminate the injection).
Total occlusions may be
caused by one of the
following:
* A closed stopcock
* An IV extension set with
the clamp
closed off
* A defective disposable
(fluid will not
flow through it).
Consider putting the
injector on hold and
investigating. There is a
high probability that no
contrast media is being
injected into the patient.