@Sidereal Thank you and that makes sense. I checked my BP about 15 min after the episode and it was actually higher than usual (102/72 which is high for me) so I don't suspect that an extremely low BP triggered the tachycardia. Although anything is possible!
It would of thou gone up by the time you checked it after an episode of tachy so may appear far higher then it was while you were asleep. So this cant show at all what it was like before the episode if far too low BP triggered off the whole tachycardia episode.
I guess the only way to figure that out would be if you were having lots of episodes of tachy and was being monitored at the time to see what occurred BP wise immediately before. This things can be quite tricky to catch and work out.
It's a great question and I have done three separate Zio Patch studies (which is a continuous heart rate monitor and a very cool device) at the beginning of 2013, then almost a year later and then mid 2014. Each time I wore the Zio for about a week and it captured probably 20-30 episodes (if not more) in my sleep and all were sinus tachycardia. The episode last night was identical to the other ones.
It could "the same thing" but being done throu a "different cause", with dysautonomia stuff.. so any different things can trigger it off.. or certain things in certain combos (that is where the hormones may play a part in your latest incident) eg if your meds caused this latest episode plus hormones
Im not saying this is what has happened but I'd think this would still be a possibility.
It took me years to figure out that this thing, this thing and this thing all together worsens my dysautonomia when individually the things were fine but coming together.. they just werent and could lead to me on a floor unconscious.