When does one need Angiography?
When you have symptoms such as angina pain, breathlessness and chest pain on exertion or at rest; if your stress test is positive for heart disease, and / or ECG shows changes, then your cardiologist would advise you to undergo Coronary angiography depending on the overall medical parameters.
The symptoms may differ from patient to patient. Some patients may be asymptomatic but still be diagnosed of a heart condition on a routine medical examination.