Stress Testing with Nuclear Imaging Flashcards
most widely used nuclear per fusion agents
Thallium 201
technestium 99m
nuclear testing can be done on ____________ or _______________
a treadmill or pharmocologically
myocardial perfusion imaging can be performed with these techniques
planar
tomographic
planar myocardial imaging uses
gama scintillation camera
three standard views
three standard views of nuclear testing
anterior
anterior oblique
left lateral
tomography imaging (SPECT)
30-32 projections each for 40 secs
deliver image in slices
thallium 201
is a metallic element with properties similar to potassium
three projections of tomography
short axis
vertical long axis
horizontal long axis
half life of thallium
73 hours
myocardial thallium activity reaches 80% after how long
1 min
peak myocardial activity is how long after thallium injection
24 mins
peak myocardial blood flow during a thallium test is reached at
1 min
regions that demonstrate increased activity at rest
significant or flow limiting stenosis
patients should fast before tests to
minimize GI intake of agent
perfusion agent is administered at this % of peak exercise
85%
how long after do delayed images become obtained later using the same technique
3-4 hours
patients are asked to eat fatty foods between delayed images because
it moves the liver out of the way
myocardial segments
designed to correspond to the customary perfusion territory of a coronary artery
anterior, anterolateral and septal areas correspond with which CA
Left anterior descending CA
inferior segments correspond to which CA
right CA
posterior, lateral segments correspond to which CA
left circumflex CA
apical area receives it blood supply from which coronary artery
left anterior descending
nuclear myocardial imaging are used on what kind of patients
with preexisting EKG abnormalities
nuclear imaging is better because
- better localization of ischemia
- improve sensitivity of stress test
patients with normal perfusion
very low risk of cardiac death or MI
patients with reversible perfusion defects in multiple vascular regions
are at high risk for future cardiac events
