I suffered from Tachycardia and the CAA wanted me to have an ablation. I had been advised that when the operation is carried out a full surgical team is in the adjoining theatre in case you have complications.
One of the side effects of an ablation is that there is a possibility of needing a pacemaker afterwards.
I was about 45 at the time and decided that I would decline the offer. The consultant put me on Sotalol and after some checking the CAA allowed me to continue flying with an "asorwith" licence.
Hope this helps.