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Help me understand "Unspecified Apnea"
#1
Help me understand "Unspecified Apnea"
My AHI is out of control and I am trying to get my Dr's attention about it, but in the meantime looking at Sleepyhead stats indicate that I have mostly Hypopneas and UA.

What does that mean?
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#2
RE: Help me understand "Unspecified Apnea"
The Resmed ST does not differentiate between central and obstructive apnea, but flags all apnea as unclassified. The ST has a backup rate that triggers IPAP pressure if a spontaneous breath is not taken. Most of the time, if there is no respiratory response to that increase in pressure, the apnea may be considered obstructive, however if PS is not high enough to cause a breath, it may be an untreated central. In your case, PA is at 6 cm which is marginal for a breath to occur. You say AHI is out of control, what are the levels of apnea (UA) and hypopnea (H) you are seeing? Did your sleep study show central apnea with CPAP pressures? I don't recall why you have been prescribed ST vs ASV.
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#3
RE: Help me understand "Unspecified Apnea"
happy face = good mask fit = 70th percentile leak is less than 24 l/m
frowny face = mask need adjustment (large leak detected), during large leak something like 30 l/m or higher, the machine score those events as "unknwon", ahi is not accurate until mask fitted correctly and leak is under control ... happy face 
resmed machine display unintentional leak (total leak minus mask or/and mouth leak)

edit: reading the previous reply, not sure if the above info apply to st machines, haven't used one
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#4
RE: Help me understand "Unspecified Apnea"
My sleep study was unremarkable. I think the AHI was about 8. That does not comport with the real world numbers. AHI is from 10 to 50. Has been under 10 only twice in the last six months. My machine was changed from S to ST in April. I am trying to get my dr interested in ASV.
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#5
RE: Help me understand "Unspecified Apnea"
In st mode, a PS of 5 will give me a flow of 14l/m for a triggered breath, which is about half volume. It will really help if you put a sleepyhead chart up.

I just googled the s10, it has IVAPS and introduces another volume support. (some s9 st came with ivaps and some didn't, I got the didn't.)
"The AirCurve 10 S/T features iVAPS technology which is a solution for unobtrusive ventilation. iVAPS targets alveolar ventilation for stable gas exchange in respiratory episodes. When necessary, iVAPS initiates a type of secondary pressure which takes advantage of Vsync leak compensation to better create patient-ventilation synchrony."

page 25 explains how IVAPS works in the s9
https://www.resmed.com/us/dam/documents/...lo_eng.pdf
new http://www.apneaboard.com/wiki/index.php...re_success
mask fit http://www.apneaboard.com/wiki/index.php...ask_Primer
From machine or charts for auto-cpap, set the min at 'med' median pressure, or 2cm below 90/95%. max at 20cm for now. Forum will help you fine tune settings
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