Happy they decide long time monitoring. Looks to me as the best option when one does not precisely know what happens.
It's strange they seem to have such a hard time deciding you were in NSR...
An E-cardioversion is some sort of "hard reset". It may work when the patient is clearly in afib and does not revert easily with drugs.
If you're like me, going spontaneously in and out of afib with ectopics inbetween, E-cardioversion may work but for a short period of time.
The very first EC I had worked well, but I was in afib for about 15 hours. It was my second afib episode. (The first one happened a tenth days before and stopped spontaneously after... about 15 hours).
Two months later, they tried another EC, which did nothing despite they did repeated shocks. I went back spontaneously in NSR after 16 hours of afib and had a painful ribcage for some days.
As long as I'm this kind of vagal afibber, EC is a stupid option.