Question about AHI=0 on Resmed S9 Autoset and Software

Interestingly enough, after not unplugging the unit and having 3 nights of roughly AHI=1 since the zero, last night I got another 0, second one ever.

In contrast to the others that posted, once again I have NO event portion on my graph. ALL other info is there however, pressure, flow, snore, etc and I still find this a little strange.

I am definitely leaning towards it being a legit zero however, as the Flow limitation shows very very little trouble breathing the whole night and pressure barely moved off the minimum, very much like the other zero night. I did check to make sure the numbers vary from one zero night to the other, and they do (ie pressure is slightly different, overall time of sleeping, etc).

ozij wrote:

Jayjonbeach wrote:Well last night I did not reboot machine or anything, I just wanted to see what would happen.

AHI = 1.2 for last night, and of course all things on graph are present incl events section.

For the prior night, events section is still missing.

Two people report that when they have a zero night the event part of the graph is still there (with no events showing) so I guess it was just a minor one night glitch and I'll never know for sure if it was a real zero night or not....

Thanks for all the input.

You have to compare it with a 0 AHI chart for 24 hours (noon to noon).

Hi Ozij. I am not sure what you mean here, the charts in ResScan are 24 hours, from noon to noon. NOW that I actually have two zero nights I can compare the two but I am not sure that confirms anything except both do show different information and are not static, however both are missing the event part of the graph completely too.

Jayjonbeach wrote:however both are missing the event part of the graph completely too.

Which event graph is missing? There are two, one that shows the vertical bars with the duration in the box at the top, and the other is a line graph that goes up one for each event for a one hour period, and then resets to zero.

idamtnboy wrote:

Jayjonbeach wrote:however both are missing the event part of the graph completely too.

Which event graph is missing? There are two, one that shows the vertical bars with the duration in the box at the top, and the other is a line graph that goes up one for each event for a one hour period, and then resets to zero.

Both, the whole thing. You look at the night before and everthing is there with apneas plotted on the graph. Maybe to help clarify I should have said I am looking at "detailed graphs". (I dont find the summary graphs helpful at all)

You look at either night in question, and the whole event part of the graph is missing, its not even an option to look at it.

Flow Limtation is the last thing on the graph now, the event part of the graph that is normally below it, is entirely gone, if you go to graphing options, you can not even select it. So there is Flow Limitation, Snore above that, Pressure above that, etc all these parts of graph are intact and show info. Event part of graph normally below Flow Limitation is gone and of course no events can be shown, it cant even show zero events because there is no event graph.

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So it seems my version of the software 3.11 or my version of the firmware in my machine (dont know) seems to think that having no events means there is no need to view an events graph, at all, seems reasonable if this is what is happening, though as I mentioned it is contradictory to what others have reported. So to clarify, a zero night, 3 nights of roughly AHI=1 without unplugging or changing anything, then another zero.

Jayjonbeach wrote:Interestingly enough, after not unplugging the unit and having 3 nights of roughly AHI=1 since the zero, last night I got another 0, second one ever.

In contrast to the others that posted, once again I have NO event portion on my graph. ALL other info is there however, pressure, flow, snore, etc and I still find this a little strange.

You need to compare what happens in your machine with what happens to other peope who had 0 AHI during the whole 24 hour period the chart refers to. If a person takes a nap and has 0 AHI in the nap, but some AH at night, of course
the chart will be there. Ditto if a person has an AHI=0 night, but some events during a nap.

Did you feel well after those 0 AHI nights?
O.

My S9 started reporting zero events every night. The graphs contained events every night lasting more than 10 seconds. I took at least a dozen print outs with the S9 to
my DME. DME sent it to ResMed for repair and included my print outs. ResMed replaced my S9 with a brand new machine, the process took two weeks.

I had at least 7 consecutive nights with zero events before taking the S9 to my DME.

Jayjonbeach wrote:

idamtnboy wrote:

Jayjonbeach wrote:however both are missing the event part of the graph completely too.

Which event graph is missing? There are two, one that shows the vertical bars with the duration in the box at the top, and the other is a line graph that goes up one for each event for a one hour period, and then resets to zero.

Both, the whole thing. You look at the night before and everthing is there with apneas plotted on the graph. Maybe to help clarify I should have said I am looking at "detailed graphs".

I don't remember if you answered this already or not. For the night the event graph is missing is there an EVE file on the SD card? I know if a particular data file is not on the card for a given night, there is no graph shown in Resscan. The summary graphs are plotted from data in the the STR file in the root directory of the card. The detail graphs are plotted from the individual data files in the DATALOG folder. Summary and detail graphs in Resscan do not share data.

ozij wrote: You need to compare what happens in your machine with what happens to other peope who had 0 AHI during the whole 24 hour period the chart refers to. If a person takes a nap and has 0 AHI in the nap, but some AH at night, of course
the chart will be there. Ditto if a person has an AHI=0 night, but some events during a nap.

Did you feel well after those 0 AHI nights?
O.

Ahhh I see your point now thanks for clarifying, someone elses graph. Yeah someone saying they had a zero night may not be the whole story as you point out.

Well I felt close to the same of an AHI=1 night, which is pretty good for me, though I am one of those where the numbers are not neccessarily telling the whole story. Last night is a good example, I had many arousals due to my wife and the weather which was VERY windy so there were tons of noises and the machine came up with AHI=0.6. Looking at my graphs it does look like my breathing was good overall but I am tired today more than usual.

idamtnboy wrote:I don't remember if you answered this already or not. For the night the event graph is missing is there an EVE file on the SD card? I know if a particular data file is not on the card for a given night, there is no graph shown in Resscan. The summary graphs are plotted from data in the the STR file in the root directory of the card. The detail graphs are plotted from the individual data files in the DATALOG folder. Summary and detail graphs in Resscan do not share data.

I just checked and the night in question has all the files on the card. It has 1 BRP.edf, 1 EVE.edf, 1 PLD.edf & 1 SAD.edf. Each one of those also has a matching .crc file making 8 files for any given night, which is consistent with every other night.

So it would appear that the software is responsible for not showing the part of the graph with zero events on it, there is literally nothing to show I suppose (unlike the other graphs which even when things are good still plot something like a flat line) but still a little odd I find.

Jayjonbeach wrote:I just checked and the night in question has all the files on the card. It has 1 BRP.edf, 1 EVE.edf, 1 PLD.edf & 1 SAD.edf. Each one of those also has a matching .crc file making 8 files for any given night, which is consistent with every other night.

So it would appear that the software is responsible for not showing the part of the graph with zero events on it, there is literally nothing to show I suppose (unlike the other graphs which even when things are good still plot something like a flat line) but still a little odd I find.

This is when this forum needs an emoticon to show shrugging shoulders and blank stares! I'm as mystified as you are.

The BRP, PLD, and SAD, files all have data that is a series of fixed time increments with data for each of those times. In contrast, the pertinent part of the EVE file simply has three columns of data: time of onset, duration, and type of apnea. If there are no events then there will be only the usual first record in the file with data 0, 0, Recording Starts. It appears that if there is no subsequent record in the file then Resscan doesn't show anything.

I have not yet had a zero AI night so I can't look at anything I've got to get a better idea.