New guy looking for help analyzing data.

[MagicCityDawg]

I'm not even real sure what all these graphs mean. I'm sure I could find out if I keep reading on here, but if someone could take the time to explain it, that would be great.

[joeattardi]

Welcome to the board.

I am still learning about how to analyze all the graphs, but I can at least share with you what I have so far.

In the summary data, the most important numbers are your Apnea index (AI), Hypopnea index (HI), and AHI (combination of AI and HI). The AI is how many apnea events occurred, on average, every hour. The HI is how many hypopneas occurred, on average, every hour. AHI is the combination of both, and is an important indicator of how well your APAP therapy is working.

As for the graphs - I am not familiar with some of them, but here are some tips:

Pressure: This shows how your APAP pressure was adjusted during the night.
Flow: This is a graph of every breath taken during the night. Zoomed out it is not terribly useful, but as you zoom in you will see individual waveforms for each breath. When you experience an apnea event, the graph goes almost flat as airflow is restricted.
Leak: This is how much air is leaking from your mask. The more leaks you have, the less effective the therapy will be.
AHI: This is a plot of how your average AHI changed during the night.
Events: This shows all the apnea/hypopnea events you had during the night. The higher the line, the longer the apnea lasted.
Snore Index: This is a measure of how loudly you were snoring.

The two I'm not sure about are Minute Ventilation and Flow Limitation.

Looks like you had a good night with an AHI of 0.2!

[Pugsy]

Report graphs don't seem to coincide with hours of use though. Should be squiggly lines for the reported length of time being used unless you were awake for over half of the 7.5 hours of reported use. I see only about 2 1/2 to maybe 3 hours of squiggly line stuff.

No event triggers on the graphs. Not even a tiny one. Something is not quite right with the graphs. I don't use this kind of machine so can't speculate.

[robysue]

Report graphs don't seem to coincide with hours of use though. Should be squiggly lines for the reported length of time being used unless you were awake for over half of the 7.5 hours of reported use. I see only about 2 1/2 to maybe 3 hours of squiggly line stuff.

Pugsy, there's no prolem with the length of time of the data here:

The "squiggly lines" for the main par of the night start at a bit after 21:00, which is 9:00. Call it the starting time sometime between 9:15 and 9:30 pm.

The "squiggly lines" end a bit after 5:00 AM---call it 5:05.

Difference between 9:15 PM and 5:05 AM is right at 7:50, which is close to the machine's time of use---7:51. (7 hours and 51 minutes---not 7.5 hours.) The data for the entire night is shown. It's just squashed a bit too much in the horizontal direction.

[quoteNo event triggers on the graphs. Not even a tiny one. Something is not quite right with the graphs. I don't use this kind of machine so can't speculate.[/quote]Two hypopneas are shown on the Events graph. They are the little blue squares. First hypopnea appears to be in tiny mask on event that took place a bit before 5:00 pm (t = 17:00 on graph). The second hypopnea occurs around 4:30 am.

Since the HI is 0.2 and the time the machine was on is 7.5 hours, we'd expect about (.2)*(7.5) = 1.5 = 2 hypopneas (1.5 rounds up to 2). So chances are neither of those little blue squares are hiding other little blue squares.

The flow data is so compressed horizontally that you can't say much about it.

The flow limitation graph shows a fair amount of "minor" flow limitations all night long---where "minor" means the flow limitations don't cross the half-way point from OPEN to CLOSED. There is one dip in the flow limitation graph that indicates the flow dropping just at or just below the half way mark between OPEN (top) and CLOSED (bottom). I know that S9 AutoSets respond to dips in the flow limitations even when they are above the half-way line. I use "minor" to describe these flow limitations only because I believe a PR System One would likely not score any "Flow Limitation Events" or score very few of them---based on the fact that when I used the S9 I had flow graphs that looked like this one pretty regularly and now that I've been using a PR S1 BiPAP for about 50 days, the PR S1 has yet to score a Flow Limitation event in my data. [Flow Limitation events only show up in Encore.]

Judging from the Leak graph, Mr. Green Smiley Face showed up on the short form of the Sleep Quality report on the S9's LCD the morning after this night. The leaks are all below the RedLine, so the Resmed engineers would say that neither the therapy nor the data are seriously affected by the leaks. But as a user of xPAP, I'd say many of the leaks are large enough where they likely caused discomfort and possibly some awakenings or arousals during the night.

Snore graph indicates snoring was not a problem on this night.

Minute ventilation is defined as: "Respiratory minute volume (or minute ventilation, or flow of gas) is the volume of air which can be inhaled (inhaled minute volume) or exhaled (exhaled minute volume) from a person's lungs in one minute. ..." according to http://www.google.com/search?hl=en&clie ... d=0CBMQkAE. Not sure of the significance of the Minute ventilation graph for the typical OSA sufferer.

[Pugsy]

The flow data is so compressed horizontally that you can't say much about it.

Ahh, thank you for explaining it. I am so used to seeing the data all spread out.
I do appreciate your taking the time to explain it.

So to OP, Hey, you are doing great. Congratulations and forget what I said earlier. I couldn't see the time lines. Might be my poor eyes and might be part of my screen resolution making things small.
Keep up the good work.