Ok thank-you for your response.I am not a doctor AND I cann't give medical advice.
That said, here is what usually happens.
They find some abnormality in your pulse rate OR blood pressure OR they hear some murmur in your heart. What hospital will do during that visit of yours is that they will ask one or more test. That is usually ECG. IF there was an issue in ECG test -- which is rather very obvious when they take it as the machine itself tells it, they will do even more test, usually a 2-D echo. IF there was high blood pressure a kidney function test is also done (it usually means one more blood test.)
Now assuming they did only ECG, likely, ECG was not bad. Otherwise, hospital at that point would have asked for the 2-D echo / treadmill test OR would have asked you to book an appointment for it then and there. This is because it makes clinic/hospital some money AND it speeds up things. If you send all the reports to IRCC, things go faster. Its benefitial for both clinic and for you too so it is usually done this way.
There is also a chance that IRCC may insist on a "furtherance" and will make you take a 2-D echo / TMT even if clinic/cardiologist says okay to you.
Kidney function test takes a lab report.
Now if further issue shows up in 2D echo or TMT, it will lead to a consultation with a cardiologist. Assuming you have no history of heart troubles, they will go over the family history of heart issues.
Now what IF there is something really wrong. Well, that depends upon what is wrong. Cardiology is a whole discipline in itself and beyond this, a doctor can only tell.
Hope it's not that complicated in my case.