I had RF ablation surgery 12 years ago, to correct recurring episodes of tachycardia. My heart rate would take off to 200 bpm. I was awake during the procedure, with only very mild sedation. The scope probe was inserted in one side of my leg and the tool was inserted in the other.
First, the cardio electrophysiologist triggered the tachycardia and mapped the electrical path of the short circuit. Next, he burned the short circuit connection with the RF probe, just like cutting a wire. I could feel my heart take off during the testing.
There was no pain with this procedure. I don’t recall how long the surgery took. After it was over, I had no more tachycardia events.
About 6 years after the surgery, I developed an occasional irregular heart beat. This was found while I was preparing to have rotator cuff surgery. This problem was deemed to be not serious, and I was cleared for anesthesia on this and a couple of other occasions since.
I chose the RF ablation option instead of trying medicines, which might or might not have worked, to control the tachycarda. The doc said he could fix the problem, and he did. I would have the surgery again.
Good luck with your condition and with the surgery if you decide to have it.