Honestly, the stress MRI is HORRIBLE. I'm not sure what you would be injected with to stess the heart but I was given adenosine and it was the worse experience of my life. I asked the doc on the other forum and this is what he said:
"I tell people before they receive adenosine that they are going to feel like ****. A close friend of mine had VT at a young age and told me that when I give patients adenosine to make sure they know they feel like they are going to die but that they won't. It impressed upon me that a minority of peole that receive adenosine have significant symptoms, while the majority feel a brief flushing. Adenosine should cause no long term problems though. It is incredibly quickly metabolized and is in your heart as we speak as a native hormone/chemical that your body makes."
The nurse told me I'd feel a slight warming sensation like I just stepped out in the sun. Not even close, I've had two kids with no pain meds and this was WORSE.
Anyway, I've had both and I would do the Nuclear test 200 times before I'd do another STRESS-MRI.
I wish you well.
The radiation in a stress test is less than a chest xray. SO dont worry about it.