Are there any signs or characteristics or something that help seperate the two?
Just a comment here.. 130bpm seems very slow for SVT. SVT ranges are usually 160 to 240 or so. I would think that if you're healthy, if you have no history of heart disease, if you have never taken illegal drugs, the chances or VT are rather low. Now, my daughter has been having episodes of a-fib. In fact, she is having an ablation next week for it. Her afib episodes range in the 130's, although they were much higher before drug therapy. When I felt her pulse in her wrist during an episode, it felt like slow SVT. It was a steady beat, with only occasional messed up rhythm.
Having had a near lifetime of SVT, I can tell you that you can function quite well with it, especially if you're already at high cardiac rates such as experienced in a strenuous sport. I remember finishing a cycling or speed skating event, situations where heart rates could be over 200bpm, and as my respiration slowed, it became quickly apparent that while my breathing slowed, my heart rate was a steady 220 or so. So yeah, while jumping to 'hyperspace' from a resting pulse is very obvious, an SVT event at high respiration and heart rates might not be so noticible. For me, I couild function just fine and never felt like I might pass out.