Hi friend,
Welcome to Health Care Magic
Angiogram is an investigation. The aim of any investigation is to modify the treatment, based on the result.
Usually,
stress ECG is done in case of doubt... If the symptom is typical and if there are definite risk factors, angogram may be done directly, though it is not common.
If TMT (Treadmill Exercise ECG) suggests
ischemia, it is an indication for further work up – because at times, there may be false positive or false negatives. The next step is TMT 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) – CT angio is non-invasive study for the anatomy. If positive, you will need catheterisation, anyway. 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.
Take care
Wishing speedy recovery
God bless
Good luck