When is sleep apnea related hypoxia clinically significant?
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When is sleep apnea related hypoxia clinically significant?
It's a question I've been pondering for a while now. Especially since its the number one factor in sleep apnea disease outcome and all associated comorbidites and complications. When is it significant? I have a mild degree of it (my nightly time below 90% SPO2 is less than 0.1%, in my case closer to 0.09 or even less than that. But my nadir spo2 is 87-86% on bad days) I wake up feeling like my head sleept in the toilet. Ive read of examples of people spending 30% of their sleep time below 90% with a nadir even in the 60s. When is it significant? Do all levels of hypoxia cause problems?
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Last edited by tiredandscared on Sat Aug 01, 2015 3:20 am, edited 1 time in total.
Re: When is sleep apnea related hypoxia clinically significant?
I'm sure others can clarify this, but some of the studies I've read actually DEFINE hypoxia, in relation to sleep studies, as time spent under 90% blood O2. It could be though, that that was just the guiding line for the study rather than the clinically significant line-in-the-sand where patient is affected that you are describing.
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Re: When is sleep apnea related hypoxia clinically significant?
My understanding is that the Medicare rules ( and most insurance companies follow the Medicare rules ) indicate that supplemental oxygen is indicated when the SpO2 falls below 88% for a total of 5 minutes or more overnight. The effects of low oxygen (hypoxemia) are non-linear and get rapidly worse as the percentage decreases.
Low oxygen levels as defined by the Mayo Clinic occur when the SpO2 level gets below 90%.
Mayo Clinic on Hypoxemia
Low oxygen levels as defined by the Mayo Clinic occur when the SpO2 level gets below 90%.
Mayo Clinic on Hypoxemia
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Re: When is sleep apnea related hypoxia clinically significant?
When I had my initial sleep study done I apparently spent a lot of time in the mid 80% range They said I hit a low of 72% at one point (although I wonder if there was an equipment malfunction since that seems almost too low), and that's when they woke me up and started oxygen on me. They then initiated a split study. My takeaway from that is the 80% range is considered not good, and if you're in the 70% range it's considered really bad.tiredandscared wrote:It's a question I've been pondering for a while now. Especially since its the number one factor in sleep apnea disease outcome and all associated comorbidites and complications. When is it significant? I have a mild degree of it (my nocturnal time below 90% SPO2 is less than 0.1%, in my case closer to 0.09 or even less than that. But my nadir spo2 is 87-86% on bad days) I wake up feeling like my head sleept in the toilet. Ive read of examples of people spending time in 30% of their sleep time below 90% with a nadir even in the 60s. When is it significant? Do all levels of hypoxia cause problems?
Re: When is sleep apnea related hypoxia clinically significant?
I can tell you that the best they could titrate me was 91 percent, but it's hard to separate whether the reason I still don't feel great is because of lower oxygen or still not getting 7-8 hours of uninterrupted sleep. For a comparison, a healthy person under 50 with no apnea does not typically have blood oxygen falling below 95 percent while sleeping. Even with a cold, most still apparently maintain that level.
I'll bet those spot 70s are due to a prolonged apnea.
I'll bet those spot 70s are due to a prolonged apnea.
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Mask: AirFit™ P10 Nasal Pillow CPAP Mask with Headgear |
Additional Comments: Sleepyhead |
Diabetes 2, RLS & bradycardia
Airsense For Her; Settings: range 8-12, Airfit P10 (M)
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