Tink posted something almost identical to this below. Can't remember the thread title but look for the poster's name. All I know is Tink was diagnosed with PSVT with a rate over 200 and it lasted long enough that she had to go to A&E. Plus it seems to pop up at other times as well. That's not enough to say she needs an ablation.
We talked about triggers and vagal maneuvers. I agree, ablation should be last choice. My rates never go over 200 but get close sometimes. My first cardio (Dr. Grumpy Pants) just didn't think I should live with as much tachy as I had at the time. It's such an individual decision, that's for sure.
I'm jumping in on something that's got a history that I am not aware of, so if my input isn't on the mark, please excuse.
I believe the best strategy for dealing with heart rhythm problems is to identify what they are and then to try the lightest medication that will give relief Actions like ablation should be reserved for those cases that don't respond to treatment with medication. This is based on the strategy of trying the lowest risk methods first, and going to higher risk procedures if they are shown to be necessary.