myocardial perfusion imaging


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imaging

 [im´ij-ing]
the production of diagnostic images, e.g., radiography, ultrasonography, or scintigraphy.
digital subtraction imaging a technique in radiography in which electronic subtraction allows the visualization of individual images; see also digital subtraction angiography.
electrostatic imaging a method of visualizing deep structures of the body, in which an electron beam is passed through the patient and the emerging beam strikes an electrostatically charged plate, dissipating the charge according to the strength of the beam. A film is then made from the plate.
gated cardiac blood pool imaging equilibrium radionuclide angiocardiography.
horizontal beam imaging a grid positioning technique in radiology in which the grid cassette is positioned with its lead lines perpendicular to the floor.
hot spot imaging (infarct avid imaging) infarct avid scintigraphy.
magnetic resonance imaging see magnetic resonance imaging.
myocardial perfusion imaging myocardial perfusion scintigraphy.

myocardial perfusion imaging

A technique in which the regional distribution of blood throughout the myocardium, is determined by injecting a radiopharmaceutical–eg, 201Tl. or 99mTc and capturing images with a gamma–scintillation camera; by determining blood and oxygen distribution, MPI informs on the hemodynamics and functional effect of coronary arterial stenosis

myocardial perfusion imaging

Abbreviation: MPI
The use of radioactive isotopes, such as 201Tl or 99mTc sestamibi, to gauge the blood supply and viability of the regions or walls of the heart. MPI is frequently used to assess patients with coronary artery disease, often in conjunction with exercise tolerance tests. A patient with a coronary artery that is almost totally blocked may take up only a small quantity of radioisotope during exercise but much more of the tracer after several hours of rest. By contrast, heart muscle that is fed by a completely blocked artery will take up no radioisotope either during or after exercise.
See also: imaging
References in periodicals archive ?
Indications for myocardial perfusion imaging with exercise treadmill testing are a high pretest probability for CAD, an abnormal baseline ECG such as left bundle branch block, previous myocardial damage or coronary revascularization, or a previous equivocal or unexpected exercise ECG result.
Myocardial perfusion imaging has been suggested to have a lower specificity in women than echocardiography, and a meta-analysis of 21 studies indicated this.
This is due to the fact that myocardial perfusion imaging is the most accurate noninvasive means of detecting coronary artery disease (CAD) and assessing the severity and extent of perfusion defects in patients with coronary stenosis.
COMPASS represents a third independent validation study for Corus CAD, comparing the test to myocardial perfusion imaging (MPI) in a population of stable symptomatic patients with suspected obstructive coronary artery disease.
Objective: To find out the effect of simple hand pump exercise on standard adenosine stress technetium-99m sestamibi myocardial perfusion imaging in patients who were unable to perform on treadmill or bicycle ergometer.
The COMPASS (Coronary Obstruction Detection by Molecular Personalised Gene Expression) study was also designed to compare the diagnostic performance of Corus CAD to myocardial perfusion imaging (MPI), a standard test that uses a radioactive agent to evaluate the blood flow and function of the heart, the company said.
Ischemia induced during stress protocols for echocardiography or myocardial perfusion imaging (MPI) indicates impaired coronary perfusion in the face of increased oxygen demand.
Objective: It has been postulated that if patients fail to achieve their age-predicted target heart rate (THR: 85% of predicted maximal HR), the electrocardiographic changes following exercise treadmill test (ETT) and also scintigraphic results of this stress protocol for myocardial perfusion imaging (MPI) are unreliable.
SAN DIEGO -- Nearly 80% of patients with type 2 diabetes who had silent myocardial ischemia revealed by stress myocardial perfusion imaging had a reversal of exercise-induced myocardial perfusion abnormalities when they were retested 3 years later.
Stress myocardial perfusion imaging has a sensitivity of >90% for detecting patients at risk of cardiac death or MI.

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