Bea - It may be serious, but it shouldn't make you panicky. You know what the problems are; you have people testing, observing, and monitoring the situation; and modern medicine is astoundingly capable. Things can be done today (via catheterization) that would have required open heart surgery a few decades ago, and would have been incurable a few decades before that. Knowing what you (and the docs) know, you should be able to manage his condition safely for the future. It's when you ignore problems that they cause the worst problems.
I'm still waiting for my next meeting with the electro-cardiologist (after I wore a Holter EKG monitor for 48 hours). He went in with a catheter and explored where the signals were going and where they weren't, and ablated (burned) four locations until he was happy with the result (Atrial Flutter stopped). With the Holter monitor, he will have a record of every single heartbeat for 48 hours to study (which is why it takes a specialist quite some time to return a finding).
I don't know if your hospital has something like the University of Michigan Health System's "Patient Portal". I can go online and see things like all past and future appointments, test results, billing (this episode has cost my
insurance almost $100,000 so far), and (what was most interesting to me) the complete narrative of my "visit".
It was about 30-40 pages of tiny print with every comment by every care-giver (docs and nurses) about what they did and what they observed, as well as the tests ordered and the results. The narrative had as many acronyms (most of which I had to look up online - wut the heck is JVD? It's Jugular Vein Distention and I didn't have any on several occasions) as English words, but I plugged on
through. It seemed as though it matched up well with everything I remembered happening, and everyone seemed to feel that things went well.
{I did note that there were quite a few errors, in the sense that when they were questioning me about my personal history, it seemed that they didn't listen very carefully. I'm pretty sure that I gave accurate answers about my smoking, vaping, drinking, and exercise history to quite a number of people, but what they recorded varied wildly, and was largely inaccurate. They commented that I was alert, lucid, and aware at all times when I wasn't actually under anesthesia or asleep. (To me this suggests that I probably gave correct answers to questions about my history - I wasn't babbling nonsense.) I am in the process of getting this corrected; it's not good to have errors in your medical record.}