In stress testing, perfusion defect that persists after exercise and at rest is referred to as a fixed defect. This means there is one or more totally blocked coronary arteries and one has had damage done to the heart muscle because of a heart attack. There is an area (or areas) of the heart muscle that has become scar tissue (scarring, scarred) because of the MI. This area would not be able to make functional use of any oxygen even if blood flow to that area of the heart were completely restored.
Anterior is front and lateral is side, this is the area of cardiac muscle that shows the perfusion defect.
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