jamiswolf wrote:jnk wrote:A home oximeter tells us nothing about how well we sleep and how many arousals we have that may be ruining our sleep. Treating SDB is about sleep, not just O2 saturation. . . .
I hesitated responding to this since it might end up triggering more nonsense.
Nonsense? From whom?
I am glad you responded. It is a key point of mine that I end up having to make a lot.
jamiswolf wrote:But this is serious mis-information. Sleep doctors use oximetry to guage effectiveness of therapy...or at least mine does.
Apneas cause desats which show up on oximetry.
But if jnk says it has nothing to do with sleep quality...well it must be true.
Jamis
Not necessarily. I am wrong a lot.
But I
would ask that you read my statement carefully. I am
not saying that O2 is
unimportant. O2 saturation is
one thing that PAP improves, but it is not the
ONLY goal of PAP therapy.
That is why checking one's own sustained O2 saturation might be
useful, but it is
not, by any stretch, the final measure of sleep quality.
That is because it is possible for us to self-titrate pressure high enough to stop low overall O2 but still not have pressure high enough to stop all the disturbance of sleep. And disturbance of sleep can do a
lot of damage physically, mentally, and emotionally--EVEN WHEN O2 saturation looks fine on a home oximeter.
The oximeters used in a sleep study are used to identify the quick desats that help to identify events. But few home oximeters are that sensitive. And a full lab/center PSG monitors
arousals, not just
desats.
That is why I feel it necessary to point out to the home-oximeter obsessed that . . .
jnk wrote:A home oximeter tells us nothing about how well we sleep and how many arousals we have that may be ruining our sleep. Treating SDB is about sleep, not just O2 saturation. . . .
The point is that oximeters measure O2, not arousals.
To sum up, you
can have arousals without having
any desats show up on your home pulse-ox. Those arousals
can disturb the quality of our sleep in significant, but silent, insidious ways. That is why a good sustained O2 level, as important as that is, does
NOT prove you are sleeping well. It
only proves you are breathing well enough to keep your O2 levels from dropping. And that is
not necessarily good enough. And that is why
real sleep studies glue wires to our heads and all that other cool stuff and hook us up to a
sensitive, calibrated,
accurate oximeter that catches the quick dips that can indicate significant events, instead of just plucking a $100 Chinese home pulse ox on the end of our fingers that mostly only catches sustained drops, and then calling that good.
Hope that wasn't too nonsensical. I'm actually a pretty serious guy when it comes to the sleep stuff. And I have a few home pulse-oxes that I occasionally use during sleep. I just think it is important to know what the info from our home oximeters does, and does not, tell us, so we can make decisions that are more fully informed than: "Hey we can all prove what we're doing is effective by simply checking what our home pulse-oxes tell us!"