I’m so impressed with your monitoring technical skills and apps! I am having short runs of SVT and lots of PACs with palpitations, severe pounding of my heart. So uncomfortable! I have an Apple Watch that I use as well to monitor and record ECG during episodes. I’m glad the Val Salva works for you. Curious why you aren’t on a beta or calcium channel blocker to prevent the episodes. These work quite well for preventing SVT instead of putting up with them. I can’t answer your question about the apple watch with pulse oximeter, but I think it is a good idea to check that, which could be done separately with a regular pulse oximeter. If your oxygen level is dropping during the SVT, that might be more reason to be on preventative medication or consider ablation. I’m on generic Bystolic and it’s working well. These episodes are quite uncomfortable usually and I am surprised your doctor is so cavalier about them. I assume you have a cardiologist?