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Need help understanding lexiscan

The summary states:
This is probably an abnormal lexiscan myocardial perfusion study because of abnormal gated lv wall motion and systolic function as described in the below notes.
Artifact due to diaphragmatic attenuation, scatter from subdiaphragmatic activity.
There is a small sized, mild intensity, partially reversible defect of the LV apex.
The findings appeared to be more likely from multiple artifacts as described above. Mild and partially reversible ischemia in this segment although appeared to be less likely but can not be excluded.
Fixed basal inferior wall and basal inferolateral wall defect with no associated wall motion abnormalities suggestive of possible attenuation artifact appeared to be more likely than ischemia.
Moderate LV enlargement with mild LV systolic dysfunction.
L V ejection fraction of 52%
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