Optical blood pressure monitors

RE: Optical blood pressure monitors

Arlo Guthrie — Tue, 28 Mar 2023 08:31:57 GMT

[quote userid="2131" url="~/001/nonclinical/f/off-duty-discussions/30592/optical-blood-pressure-monitors/241181#241181"]Only indirectly to do with blood pressure (mine)[/quote]

. Yes, of course, you're absolutely right. I feel like I should re-film that bit, but it's a lot of work ...

RE: Optical blood pressure monitors

Evelyn Barbour-Hill — Tue, 28 Mar 2023 00:08:28 GMT

Only indirectly to do with blood pressure (mine), but Tsar Nicholas 2nd (or, to be exact, ex-Tsar, since he had abdicated some time before) and his wife, son and daughters, the good doctor and a couple of old retainers, were not executed in Ekaterinburg. They were murdered.

RE: Optical blood pressure monitors

Arlo Guthrie — Wed, 22 Mar 2023 23:25:30 GMT

Finished my review, and the result is really quite remarkable …. If you know anyone who is overweight with high blood pressure, you might like to share this with them …

www.youtube.com/watch

RE: Optical blood pressure monitors

Arlo Guthrie — Mon, 27 Feb 2023 13:54:42 GMT

Michael Woodhouse and Richard Carter thank you so much!

[quote userid="3169" url="~/001/nonclinical/f/off-duty-discussions/30592/optical-blood-pressure-monitors/240901#240901"] On average it does look accurate but if you look at the scatter plots then +/-25 systolic and +/- 20 diastolic could be the difference between being normal, ill or low![/quote]

That was my conclusion, although I was confusing the SD with the range. Er ... I think.

That then raised the question in my mind ... were the erroneous readings reading-specific, or patient-specific. If the former, then they should a) stand out and b) be averaged out over time. But if b) and this was the only device being used, then it could be a real problem if it permanently told the user, wrongly, that their pressure was high or low.

[quote userid="2675" url="~/001/nonclinical/f/off-duty-discussions/30592/optical-blood-pressure-monitors/240902#240902"]So for 2/3 subjects tested or testing done, (1SD) results fell within the range of 3.9 and 3.6 mmHg[/quote]

Which again seems to raise the question about whether errors were user specific, or per reading. If it's accurate for 2/3 readings, given it is taking lots every day, then outliers should be easy to spot.

[quote userid="2675" url="~/001/nonclinical/f/off-duty-discussions/30592/optical-blood-pressure-monitors/240902#240902"]In a classic bell curve one SD either way accounts for about 66% of population, 2 SD either side for 95%, so when we talking of a test or result with P = 5, the test has 95% chance of falling within expected range.[/quote]

Didn't quite understand the relationship between SD and P. Can you clear that one up for me?!

[quote userid="3169" url="~/001/nonclinical/f/off-duty-discussions/30592/optical-blood-pressure-monitors/240901#240901"]Is this for use to decide how inflammatory a post is on here and in need of moderation?[/quote]

Um, not sure I quite understand, but no. Only reason I posted was for reason on the tin ... that I need help understanding what it is telling me!

RE: Optical blood pressure monitors

Richard Carter — Mon, 27 Feb 2023 13:30:37 GMT

No - the standard deviation (SD) ie the spread or dispersion or variance about the mean. In a classic bell curve one SD either way accounts for about 66% of population, 2 SD either side for 95%, so when we talking of a test or result with P = 5, the test has 95% chance of falling within expected range.

So for 2/3 subjects tested or testing done, (1SD) results fell within the range of 3.9 and 3.6 mmHg either side of the mean value which would be pretty good for a bed side test

At least that is what I remember from statistics 101 30 odd years ago

RE: Optical blood pressure monitors

Michael Woodhouse — Mon, 27 Feb 2023 12:52:04 GMT

I think if I was to 'trust' such a device then I'd want to compare results in myself to another machine. On average it does look accurate but if you look at the scatter plots then +/-25 systolic and +/- 20 diastolic could be the difference between being normal, ill or low! If it correlates with another meter then great, otherwise return it.

Is this for use to decide how inflammatory a post is on here and in need of moderation?