One episode of SVT does not warrent having an ablation! He/she needs to get a second opion before doing anything, It might never come up again, or it could happen every day! Beta blockers tend to help control SVT sufficiently. An ablaion should only be considered after an extended period of time and somebody being very symptomatic!

Could it be that your friend was scared to travel. Sometimes doctors don’t really cover the fact in someone body. We trust them for answers,sometimes the answers be wrong. So just be careful. It probably was aniexty causing the heart to beat different.

No, it is not congenital. What I am wondering is if this was a reaction from not being used to the altitude? Also, a one time episode of SVT does not warrant an ablation. Get a second opinion.

No, SVT can be caused by a variety of things. I think it would be difficult to prove the condition was caused by travel.

No to all of your questions. It is not congenital and it is not something that happend during his travels.