heart rhythmic isn’t deadly immediatly but if not treated can lead to congestive heart failure,
I had it and it was over a week after diagnosis that they electrocuted me, stopping my heart and then shocked me to re start it.
That must have been scary. Did they sedate you for the shock?
There’s a guy I work with who had that done.
I asked him “Did you get the ‘and restart it’ part in writing?”.
some are deadly immediately, others can go for a long time.