Hello, Thank you for your question. I will try my best to help you with your questions. I need to ask few questions before first.
Yes there is an indirect method we use to see the stent patency.
It is ETT which shows us ST changes if stent is blocked or narrowed.
You have questions ?
If you need more explanation or more details how it works ? let me know i will explain the details of how we do it. Thanks.