[FRIAM] New information on COVID-19

[Roger Critchlow]

On Thu, Apr 23, 2020 at 8:32 PM Roger Critchlow <rec at elf.org> wrote:

>
> I wonder if any of those cell phone pulsimeters could be upgraded to
> oximeters with some calibration?
>

There are a bunch of cell phone pulse oximeter apps that use the cell phone
flash and camera, but I don't get the feeling that they've been calibrated
much.  It's a lot easier to write the code, call it entertainment, and reap
the ad revenues that to actually determine what the measurement means in
the general population.  Some apps have even added some of the other pulse
oximeter functions, perfusion, respiratory pleth,   Then, again,
https://www.ncbi.nlm.nih.gov/pubmed/2921597 says "Smartphone-based pulse
oximetry is not inferior to standard pulse oximetry in pediatric patients
without hypoxia. Reliability was superior for PBA compared with CBA, with
more precise agreement for the PBA compared with the CBA. Future studies
should test pulse oximetry apps in a hypoxic pediatric population."  That
was published in 2018.

There's an interesting series of press releases from UIUC claiming that
measuring someone's gait (with cellphone accelerometers) over a 6 minute
walk is enough to get a good estimate of O_2 saturation, because people who
aren't getting enough O_2 apparently walk funny.

Here's an android app on github, https://github.com/YahyaOdeh/HealthWatcher,
with some more method references, the https://github.com/topics/spo2 listing
has a bunch of arduino projects, too.

-- rec --
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