I've learned to not put complete faith in Echo's, Stress, and Nuclear test results. Echo has been mostly good for evaluating the valves & structure, although I've had some that didn't make sense and when repeated it showed things are stable. So, Echo can occasionally be misleading but mostly reliable for valves & structures.
Nuclear results in my case was totally unreliable. It did not indicate any main vessel disease. However my doc was suspicious based on my stress and general fatigue. I never had any chest pain & the fatigue was new onset.
So, the cardiac cath is the gold standard and will remove all the guess work. I found it reassuring to really know exactly what was happening. Frankly, wish now they could have saved resources and just did the diagnostic cath straight away. They used my wrist so I considered it quick & easy.
Found a 90% right main block which was stented and 40% circumflex block not requiring treatment. Also, severe aortic stenosis. They stented the right main and did TAVR, as two more separate caths, both quick and easy. After about 4 hours bedrest after the procedures, I was up and about all evening, doing laps around the ward. Went home next morning feeling great. Breezed thru about 6 wks of cardiac rehab and after back to my normal hiking trips.
The treatment options are astonishing. If you are treated, then afterward do a Cardiac Rehab program. They will get you on track learning about a heart healthy diet and exercise.
Best Wishes!