If you've had an episode of PSVT, that's evidence that it's possible for your heart to visit that rhythm again some time in the future. Some people get it every day, while others only get it once in their lives, and there's really no way to know which boat you're in until you're out on the water. There are so many things that can contribute to PSVT, electrolyte levels, hydration levels, sleep deprivation, anxiety and stress, medications, gastrointestinal issues...you name it. So maybe you had the perfect storm of conditions for your PSVT. Or maybe it's a minor problem you'll have to address some time in the future, if at all.
Ablations aren't 100% successful, it's true, but the short-term success rate is very high and the long term success rate, at least for the data I found, was around 70%. And while there are stories here of failed ablations, remember that a kind of adverse selection is probably a factor here - those who have successful ablations have no need to hang out here and chirp about how great life is - they're out living. The ones who are still having issues are the ones more likely to stay around, looking for answers. But if you've only had one episode of PSVT and the doctors aren't worried about it, then you've probably got a way to go before you need to do any real worrying.
Jeff
Sweetie I was born with PSVT and still have it after all these years and I am 47, so to answer your question, No I don't think it does unles they do an ablastion, and from what I have been reading here, sometimes that doesn't work.
Hope that helps.