Thanks for all the comments. I certainly didn't mean to put Oximetry up as competitor to Apnea indicators. I consider them both measuring certain aspects of the breathing disorder, and:
- sometime overlapping in their function, like when I see my apneas being followed within a few seconds by O2 saturation dips
- sometime complementary in their function
- and sometime neither measure providing a good indication of what is going on: like currently for my CPAP-induced nasal congestion, or in the case of non-apneic events creating sleep fragmentation
Mrs Rip Van Winkle wrote:I was NOT commenting on desat nor oximetry testing needs....it was simply stating that it would be nice to have Oximetry testing integrated into the xpap...would be easy enough to do and have at a minimal cost.
Point taken. Looks like we both agree on oximetry having some use in home CPAP, but my extract exagerated the degree which you intended.
A counter-argument to my subject: my 2nd opinion sleep dr was in favor of an off-CPAP home oximetry test when he heard of my PSG study having significant 1st night effects. And it confirmed OSA to a moderate instead of severe degree. But once he saw my much better O2 results on-CPAP, he lost interest in oximetry. Still, I had a few nights of AHI ~5, waking up after 3-4 hours, when the only reason I could find was nose congestion and SaO2 at 91%.
I read a number of published articles promoting pulse oximetry as an inexpensive starter diagnostic tool, leading a doctor to recommend sleep testing. A certain correlation between pulse up and O2 down can even indicate going into REM sleep.
Vicki wrote:How much one desaturates is dependant ... the length of apneas, the frequency of apneas and the residual volume of air left in the lungs during an apneic event... a prominent physician in the field of OSA also said OSA should be followed by AHI not pulse-oximetry.
Vicki, I agree ... once I also see the term "cumulative" included, and once I see some numbers assigned. For example:
- one 4% dip of 10 sec duration vs. desats oscillating in sync with apneas and / or hypopneas
- one SaO2 dip below 88% vs. SaO2 drops below 90% cummulating for more than 15 min a night
Moderate / Severe OSA (2 tests offCPAP).
CPAP ResMed S9 AutoSet EPR, Hi5 Humidifier.
ResMed Masks tried: nasal pillows Swift FX, nasal mask Mirage Activa LT, FF mask Mirage Quattro or FX.
Home CPAP data analysis: ResScan 3.16 sw, oximeter, pulsemeter