Resmed S9 VPAP TX - accessing data

[Matt00926]

What would be the purpose of such a machine? Surely you can't titrate yourself while asleep. Does it record data differently than the way a normal bi-level ASV already records the data?

[DeepBreathing]

The machine is designed for use in a sleep test where a technician is constantly monitoring your sleep and adjusting pressures according to the titration protocols. It has multiple modes, from ASVAuto down to fixed pressure CPAP.

I've never heard of somebody using one for therapy but I suppose there's no reason you can't, provided you can capture and interpret the data.

[ApneaQuestions]

Precisely!

If you own one of these machines it is like owning each and every type of machine that Resmed makes in a SINGLE machine

Ideally I wanted to avoid the TxLink over to a PC and just use it as the mother of all machines.

That's why I wanted to know if anyone had reverse-engineered the direct connection into the back of the machine to avoid TXLink etc.

However, here's how I plan to use it..

1) set myself up as a patient
2) Choose the titration algorithm (eg ASVAuto)
3) Hit the start button (and the record button)
4) Go to sleep
5) Stop the pseudo-titration in the morning
6) Get the recordings
7) See if I can reverse-engineer the recorded data to input into OSCAR
8) If I can't.... just use the inbuilt data analysis of the titration software to examine the data natively in the Resmed world

If I had an inline USB Protocol Sniffer I could easily reverse-engineer the control and data protocols to make this work without all the extra hardware.
However I won't be doing that... I just thought someone may have beaten me to it.

So once I get this setup I will have each and every therapy mode available for testing without needing to buy 5 or 6 different machines.

Here are all the modes it supports in the attached image...
I guess I'm missing "Autoset for Her" but I think I got all the others.
But you get the point.. right?

All these people who start on a CPAP brick then argue with the DME to get an Autoset then fight with insurance to get a BIPAP then fight again to get an ASV.
Similarly, some people are debating if ASV or ST might be the better solution based on very specific breathing patterns and/or medical conditions.
Once I'm set up...I can do all that in 90 seconds or less.

I just like thinking outside the box and I'm a bit of a geek. :-)

[Osiris357]

Auto set for her is called “soft” in the Comfort, Response setting. If you have the AutoSet model with the response feature.

[jaswilliams]

Auto set for her is called “soft” in the Comfort, Response setting. If you have the AutoSet model with the response feature.

That is not correct, On the autoset for her there is the for her mode, and the Autoset mode. The Autoset mode has two response settings one of which is soft, this soft response setting is not the same as the for her setting.


As thi equipment is based on the S9 hardware it does not have the for her mode.

[Osiris357]

Thanks for the clarification. Just read this also.
https://www.ncbi.nlm.nih.gov/pmc/article...rt=classic
And this
https://www.resmed.com/us/dam/documents/...orithm.pdf

[ApneaQuestions]

The TxLink hardware arrived last night.

I've now got the titration system set up and it seems to work fine.
One interesting observation, the firmware in these machines is upgradable.

Earlier I said that "AutoSet For Her" was missing,
When I upgraded the firmware with the latest copy (using the utility in ResMed EasyCare Tx) I got the missing therapy mode.

Nice!

[ApneaQuestions]

Reverse Engineering the Data Files from ResMed EasyCare Tx Software

If any developer is interested in writing a parser for these titration files to allow importing into OSCAR please let me know.
I can generate more realistic data for you as the days/weeks/months go by.

When performing a titration, we can save the recorded data into a folder on disk.
Conceptually this is similar to recording data onto an SDCard but the files are slightly different

There are TWO important data files generated (and some superfluous extra files)

<PatientName><Date>EVE.edf
<PatientName><Date>DAT.edf

EVE - Contains events
Because this is a titration environment we can have "events" that are not typical in OSCAR
Start Titration
Change Titration Modes
Change Titration Settings within a Mode
Stop Titration

I would imagine that the standard apnea and hypopnea events are also reported in this file but I only did a 3 minute pseudo test to create dummy data
Obviously there were no true apneas during that test

DAT - Contains all of the graph data that would normally appear in BRP and PLD files on an SDCard

I don't have an oximeter module on this S9 VPAP Tx machine.  If I DID I'm not sure if the data would go into the DAT file or if a separate SAD file would be created.

I used the freeware Polyman EDF file viewer to look inside these files
https://www.edfplus.info/downloads/

The attached images show...
1) Polyman graphs which are very much like OSCAR graphs
2) Diagnostic showing what is contained in an EVE file
3) Diagnostic showing what is contained in a DAT file

[ApneaQuestions]

zoom image

[ApneaQuestions]

I did a true run using the S9 VPAP Tx last night in VAuto mode

Just confirming that..

1) Events go into the EVE.edf file
2) Flow Data etc goes into the DAT.edf file

Now... If I could just get OSCAR to parse these files I'd be all set.
It would also make OSCAR very useful for titration sleep labs too.

I can visualize the data using Polyman (Open Source free viewer) in the meantime.

I've attached an (edited) xls file image showing some of the events being reported in the EVE.edf file after exporting to csv format.
I hid a bunch of rows because I was getting lots of clustered CAs... I think I need to drop the PS level to stop CO2 washout.

Notice:
1) Standard events like CA, OA, UA and hypopneas
2) Titration events like "Start therapy", "Mode and settings changed" , "End therapy" etc