What is the treatment of svt?

Ablation. The preferred treatment for sustained, symptomatic SVT, in most patients, is an ablation since it can be curative (per guideline). Anti arrhythmic medicines also help ameliorate the symptoms but do not lead to a cure. Furthermore, these medications can have negative side effects.
SVT. If you have svt it can be converted by an IV injection. If its recurrent there are various choices for preventive meds available to your doctor. If the medications aren't adequate there is an ablation procedure that may be successful. There are several good medicines but the choice is by your doc with the knowledge of your individual factors.