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It is not clear – what was the investigation (scan)…
It is an indication for further work up – The next step is TMT (Treadmill Exercise ECG) with thallium isotope. It is the ideal non-invasive way to evaluate ischemia
/ to assess the PHYSIOLOGY (function) – to see whether the blood arriving at the heart muscle.
If there is a suggestion, the next step is to see the ANATOMY (structure) – undergo catheterisation and coronary angiography
with a view for possible intervention. It is the only way to directly ‘see’ the block, if any – and its location, extent, severity and so on. Coronary arteriography is invasive but it is the gold standard for this. If the major epicardial arteries are normal, one has to be investigated for spasm, as a cause…. CT angio is non-invasive study for the anatomy. If positive, she will need catheterisation, anyway.
The treating doctor alone can suggest further based on his assessment of the situation.
Wishing all well