Inferobasilar or inferobasal describes the lower part of the heart, above the diaphragm, and towards the back of the body. A fixed defect is a term for an abnormality that shows up in an xray or scan, which persists when the patient is at rest, and which occurs without ischemia (restriction of blood flow to the area).
www.doc.ic.ac.uk/ ~gzy/pub/Panting%20JMRI%202001%20perfusion.pdf
"Segments were
described as normal, reversible ischemia (normal at
rest), partially reversible ischemia (resting defect with
superimposed ischaemia), or fixed defect (resting defect
with no superimposed ischemia)."
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Regards,
Sue.