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  1. @Random-Symptom Man I'd be very interested in knowing more the Dr's interest. Is there something special about Hopkins for treatment or diagnosis of dydautonomia? I wondered eons ago if I had problems with my ANS. i was too tired to deal with it and now it's another 10 years later. BTW, the accuracy range of the Viatom output I posted recently could be +/-2%. for O2. I think it's the same for HR. Even if I add 2% for both my HR and O2 I still show troublesome variations. Good luck!
  2. More than one sleep study and MSLT. When I would have qualified for Narcolepsy I was afraid to mention it. Now that i'm much improved with transient but bothersome episodes my Dr says the only way to confirm it for me would be to examine Orexin in CSF. Apart from being a test mostly done on animals it would not lead to anything actionable that I cannot already do. I've already tried various meds for sleep and wakefulness and I can try others as much as I can tolerate...which is a big limiter for me. Dr mentioned maybe I have microsleeps. I recall saying to a sleep Dr once that at times I'd sw
  3. WarpedTrekker Everyone's O2 drops during air travel. Airplanes pressurize generally at an altitude equivalent to 8000' where there is approximately 15.4 % O2. at sea level O2 is approx 20.9%. Many can handle the reduction of O2 in breathable air and a reduced SpO2. Some will notice symptoms. look up altitude sickness for more details. I've had trouble flying for eons and trouble traveling in high places like the Rockies. A HAST (High Altitude Simulation Test) can help you to sort this out. I've had it done 2x. Once the Dr used a higher percentage of O2 and removed the lower SpO2 I had during t
  4. @toomanyproblems WarpedTrekker O2 can be added to CPAP to prevent nighttime drops. Or O2 can be used without CPAP. It may even prevent awakenings. O2 is not a solution to apneas and you could still have them with normal O2.
  5. @Random-Symptom Man good point about repeatability. Sadly, it repeats again and again. When I first got my Apple Watch I did not know how to make sense of HR data or even what my HR ought to be. It was using the AW where I first was able to correlate HR with sleepiness. I was sitting and talking with someone who pointed out that it looked like I was falling asleep. Sometime later I looked at the AW HR data and it showed a rapid drop. Now I know that correlation is not the same as causality but it's something to examine. The Cardiogram app is the best I've used so far to look at this data.
  6. I bought my SleepU sensor because I want to track my O2 during air travel. After purchase I wore it to see what the data looks like, how to download it, etc. Right away I started seeing these transient sudden drops in O2 and HR. And that brought up my question wondering if drops in HR are related to sudden episodes of unexplained fatigue. I'm trying to understand what artifact means. I know some of my readings are from a loose sensor as I do adjust it on my body, change placement, etc. The following screen grab describes some artifacts. I have one event I caught on my SleepU monitor where
  7. I also can see my pulse in my eyes. Mostly I don't notice it. I've not thought about when I notice it more and I will try to keep track of that. My eye Dr says it's unusual for someone to report it. I already have trouble reading and the pulsation makes it worse. Sorry you are experiencing this.
  8. I glanced at this post after doing a search and wondered how did one of my graphs get in this forum before my first post 🙂 I have data from Apple Watch 3 & 4 Watch heart rate data output is difficult to use. Cardiogram is useful but I find the data clearer using the Viatom software as represented in the image I attached. The Viatom products are licensed as class ll medical devices. Follow-up health care after an ER visit and charts from the Sleep U monitor have gotten me 3 Dr appointments. First they look at the outlier and say it's an artifact or slipped sensor. And maybe some of them ar
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