Around 10 yrs ago I had my first Pacemaker inserted. They attempted to do an ablation prior but my heart wouldn't demonstrate the irregularities, even with medications to stimulate them.
So, no ablation.
Since then (10 yes ago) I've had no serious irregularities (ie atrial fib) so my occasional SVT has been controlled by medication (and Pacemaker, I presume).
Just my experience....