I was looking at my AHI response to pressure changes with encore pro analyzer
I am quite surprise by the results
It looks like a sine wave
I have peaks at 5,7,11,13 CM'S
11 is the absolute worse
I have valleys at 6, 9,14 CM'S
14 gives me my best reading of 3 AHI
6 gives me my 2nd best at 4 AHI
9 my third at 5 AHI
I find this really strange.
Has anyone else experienced something comparable ?
Sleep deprived
Sine wave AHI'S
4 posts
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NarcoApneac
- Posts: 29
- Joined: Thu Mar 01, 2007 3:05 pm
- Location: Eugene, OR
Three things:
I'd say that it is not at all uncommon to see multiple local minima, i.e. wiggles, in the various graphs. This is due, at least in part, to the fact that apneas, hypopneas, and snoring usually respond best to different pressures. I've observed this watching my own data, as well as that of some aquaintences, and those who post their data here.
Data is noisy. Twenty five minutes of data at 9cm won't tell you very much about what to expect in the long term. Perhaps some of the wiggles you are seeing are "noise." The twin sciences of probability and statistics can tell you something about how much noise to expect from a certain amount of data.
Data from fixed pressure machines and auto machines need to be interpreted differently. For example, for some individual 6cm might look like a perfectly good low pressure from an auto machine, and a perfectly lousy pressure from a fixed pressure machine. That is, 6cm might be a good starting pressure, but a bad pressure at which to spend the whole night. Graphs which mix fixed pressure data with auto data can certainly introduce artifactual "wiggles," and can be an interpretation nightmare.
Good luck in your self-titration, and don't forget to consider how the different pressures make you feel.
I'd say that it is not at all uncommon to see multiple local minima, i.e. wiggles, in the various graphs. This is due, at least in part, to the fact that apneas, hypopneas, and snoring usually respond best to different pressures. I've observed this watching my own data, as well as that of some aquaintences, and those who post their data here.
Data is noisy. Twenty five minutes of data at 9cm won't tell you very much about what to expect in the long term. Perhaps some of the wiggles you are seeing are "noise." The twin sciences of probability and statistics can tell you something about how much noise to expect from a certain amount of data.
Data from fixed pressure machines and auto machines need to be interpreted differently. For example, for some individual 6cm might look like a perfectly good low pressure from an auto machine, and a perfectly lousy pressure from a fixed pressure machine. That is, 6cm might be a good starting pressure, but a bad pressure at which to spend the whole night. Graphs which mix fixed pressure data with auto data can certainly introduce artifactual "wiggles," and can be an interpretation nightmare.
Good luck in your self-titration, and don't forget to consider how the different pressures make you feel.
you want to make sure you run the report with a full weeks data (7+ days) and look at the AHI vs. Pressure report.
That should then use long term trend data in the calculation of that data. Very difficult to take one or two nights data and get any meaningful results from that report.
You want to look for the AI/HI informational plot on a downward trend vs upward, same for NR(AH) or Non-Responsive Apnea/Hypopnea should also be non-existent and/or on a downward trend.
That report can help you find your sweet spot, you should use it combined with the other reports to confirm any finding.
That should then use long term trend data in the calculation of that data. Very difficult to take one or two nights data and get any meaningful results from that report.
You want to look for the AI/HI informational plot on a downward trend vs upward, same for NR(AH) or Non-Responsive Apnea/Hypopnea should also be non-existent and/or on a downward trend.
That report can help you find your sweet spot, you should use it combined with the other reports to confirm any finding.
someday science will catch up to what I'm saying...
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Sleepdeprived
- Posts: 325
- Joined: Mon May 14, 2007 3:07 pm
- Location: Florida
[quote="Snoredog"]you want to make sure you run the report with a full weeks data (7+ days) and look at the AHI vs. Pressure report.
That should then use long term trend data in the calculation of that data. Very difficult to take one or two nights data and get any meaningful results from that report.
You want to look for the AI/HI informational plot on a downward trend vs upward, same for NR(AH) or Non-Responsive Apnea/Hypopnea should also be non-existent and/or on a downward trend.
That report can help you find your sweet spot, you should use it combined with the other reports to confirm any finding.
That should then use long term trend data in the calculation of that data. Very difficult to take one or two nights data and get any meaningful results from that report.
You want to look for the AI/HI informational plot on a downward trend vs upward, same for NR(AH) or Non-Responsive Apnea/Hypopnea should also be non-existent and/or on a downward trend.
That report can help you find your sweet spot, you should use it combined with the other reports to confirm any finding.
4 posts
• Page 1 of 1