This post got pretty long so I separated it into questions and background. Questions: 1. Do any forum members have a diagnosis of SVT (supraventricular tachycardia)? 2. Has anyone tried the Kardia mobile device/app (portable type of ekg)? Background: I don't know what kind of SVT I have. Based on my age of onset and medical history my cardiologist thinks it is AV nodal re-entrant tachycardia. My episodes are pretty random so it has never been caught on any EKG or holter monitor. My SVT can happen twice in a week, even twice in a day. Or it can not happen for a whole month. And like I said, it's not bad enough that I've ever bothered to do more testing (I guess technology has really improved since my holter monitor in the early 1990s). I'm pretty blase about my SVT because I have had this since age 11. The episodes were scary the first couple times they happened when I was a kid. But I quickly got used to them. And it never stopped me from doing anything. My SVT episodes are both annoying and exhausting but they have always been a minor background thing. My heart always returned to a normal rhythm by itself within 2-3 mins. But after I hit 40-ish (?) the episodes started to last longer. Now it can last as long as 45 minutes and 20-30 minutes is pretty common. I've tried the Valsalva maneuver and few other things without much luck over the years. So I just lie down and it eventually goes away. Having my heart race at 185-190 beats per minute is a lot more exhausting after having ME. After all, my baseline energy is a lot lower than it was. My cardiologist has suggested ablation more than once. But unless it gets a lot worse then it is not worth it to me to do surgery (even minor surgery) for something like this. At my last appointment my cardiologist recommended this Kardia device to me. He even demonstrated it in his office. And the idea of finally being able to capture one of these SVT episodes (after 47 years of having them) is definitely appealing! Or maybe I just want an excuse to buy an updated Android phone or iPad which I need since I don't have anything compatible with this Kardia gadget. Anyway, I think it's a long shot that anyone here has used this Kardia gadget. But I thought I'd ask!