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Replies to "Here’s the bottom line. My dad died after having his second heart attack at age 38...."
They do not use dye in the stress test. They use a nuclear substance. I did not feel it at all. I opted for the treadmill instead of the shot. You just walk kind of fast on it until they get your heart rate to the number they need…based on your age. There is a chart for that. They did two scans. They first with no stress. The second after the trad mill. Each scan takes less than about 10 minutes. You have to wait 30 to 40 minutes after the iv injections for the scans. I believe that much less radiation is now used. I had the scan just three weeks ago! Nothing to fear. You can choose the treadmill if you fear the medicine. I chose it because I also have awful issues with medicines and I knew that once I got off the treadmill I could catch my breath. And I do have clotting issues that are genetic!
There are two chemicals that I know of that are routinely used to stress the heart: isoproterenol and adenosine. Isoproterenol is used to stress the heart during operations intended to correct arrhythmias. It is a 'provoking' or a 'challenging' chemical meant to make the heart work hard and reveal an underlying arrhythmia. Isoproterenol is used before an arrhythmia patient is taken back out of the cath lab after the electrophysiologist figures he/she has finished the job. Instead, they inject some isoproterenol and see what happens. If the heart lurches back into an arrythmia, he/she knows they didn't find all the foci or reentrant areas for the extra timing signals. Back to work while you're still out and in front of them. Makes sense, right?
Adenosine slows the heart. I have had it injected once. The nurses were careful to prepare me for the sensation. It's awful....sorry....it's awful. If you are alert, and IF it is adenosine, the slowing puts you in a lot of stress in a weird way that makes you feel 'doom', a feeling of dread. It is thankfully fleeting, lasting about 10 seconds, and with the mental preparation you can just endure it knowing it will pass quickly...which is exactly what happened for me. But the chemical can reveal underlying cardiac function problems by making them slow down and show up on various monitors. It was how the attending internist saw that I was actually in flutter, and not in fibrillation. As I was feeling the heaviness and doom sensation, he pointed to the ECG display and said, 'See, it's flutter.'
This is the limit of my own experience and knowledge. You may have a different chemical at work, so this is just a fr'instance I'm offering. Also, I'm not a medical health worker of any kind and have no formal training in cardiology.
https://www.mayoclinic.org/tests-procedures/nuclear-stress-test/about/pac-20385231