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Absence of pain at present does not exclude heart problem.
This is especially true in diabetic.
Your mother must be investigated for Coronary Artery
The next step is stress test
– TMT (Treadmill Exercise ECG) / preferably with thallium isotope – will be the ideal way to evaluate ischemia
This is to assess the physiology (function).
If there is a suggestion, the next step is to see the anatomy.
She must undergo catheterisation and coronary angiography
with a view for possible intervention.
Coronary arteriography is invasive but it is the gold standard for this.
[CT angio is non-invasive study for the anatomy. If positive, she will need catheterisation, anyway.]
Wishing speedy recovery