In my non-medical reading expertise (cough), medications can, and often do, do a good job for a great many people who are in the early stages of disordered cardiac rhythm. This may be the case for months, even years. However, the heart seems to have a mind of its own and is preferentially looking to advance its state of disorder. Eventually, all patients, or very nearly all, will have to change medications, up their current medications to higher doses, or submit to another form of 'therapy', or even surgery such as ablation.

You have an undefined tachy-arrhythmia that is intermittent. Or just tachycardia...you haven't said which. But this is after both invasive heart surgery and a recent ablation. It seems, on the face of it, that your heart's condition is evolving, and that the electrophysiologist did not manage to stem your rhythm problem...whatever it is. Quite apart from your original surgery many years ago, you have had an ablation, and approximately 25% of all index ablations (first ablations) do not stop the arrhythmia. IOW, they fail. I'm an unhappy example...or was until my EP agreed to try again seven months later. Happily, the statistics for second ablation success is somewhat higher at 85% across EPS globally, but remember that the first ablation got a lot of the job done. So all the EP has to do is to tidy up, usually, by improving the stockade of scarring lesions around the pulmonary veins, or he/she might need to ablate the left atrial appendage, or the coronary sinus, or even parts of the septum. The point is that, as much as it might be a bummer to find yourself in that unhappy 25%, some of us have to fall there or the statistic is meaningless! 😀

Second comment from me/or a question: why tikosyn? And not Sotolol, or Multaq, or diltiazem, or propafenone, or metoprolol, or........why just tikosyn?

Last comment: if you have an arrhythmia, you may need to be on a DOAC (Direct Oral Anti-Coagulant). Certainly with atrial flutter or fibrillation, you must be prescribed an anti-coagulant. With simple tachycardia, I don't know that it's that important...but I'm not an expert.

Challenge your expert caregiver. Learn as much as you can so that you can make an informed decision. I'm just guessing for you.