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In your heart pictures, an area may lack the radiotracer and thus show a spot of a different color, called a “defect”. Defects represent poor uptake of the radiotracer by the heart because of reduced blood flow.
When a defect occurs at peak exercise and not at rest, the most likely cause is a significant blockage of a coronary artery. When a defect is observed both at rest and with exertion, that indicates that previous damage from a heart attack has occurred and that the heart muscle has a scar.
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