Here is an excellent clinical review of SVT from the National Libraries of Medicine. SVT and all arrhythmias are very complex. We are fortunate to have SVT which is considered a more benign arrhythmia. I have had SVT for 40 years. I get it 6-8 times per year and it is almost always associated w exercise. I take a beta blocker when I have SVT. And more recently have used the REVERT maneuver which has now worked 6/6 time a for me! The NLM article references the REVERT procedure and my cardiologist also endorsed it. I have now used the REVERT in my home, on a hike in the woods twice and most recently in the swimming pool. I am delighted that this works and I now take my beta blocker ( inderal) only if the REVERT doesn’t work. I recently saw a cardiac electrophysiologist who offered an ablation but was totally supportive of my decline and my current management with REVERT and beta blockers.
https://www.ncbi.nlm.nih.gov/books/NBK441972/