Hi there Occasionally my HR increases to 95-100 BPM, which my Kardia app picks up I sit and inhale x 4 sec and exhale x 8 sec which helps to jump start the parasympathetic nervous system, slowing my HR I live in the mountains of NC and find that somedays my shortness of breath is worse, especially if there is a storm coming in. I recently traveled to LI, NY and didn't feel any severe SOB, so perhaps living at a higher altitude in NC is partly responsible. Anyway I wish you luck and encourage you to try the breathing I mentioned when your HR is speeding up, hope it helps. Sounds like your Docs have ruled out A Fib, mine too, but I bought a Kardia Mobile on Amazon as suggested by my cardiologist to keep track of things. All the best, Mary
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