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False Increase in Apneas with Respironics - Printable Version

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False Increase in Apneas with Respironics - kbauhs - 09-19-2021

In April I started seeing a slow but steady increase in the number of apneas, particularly central, with my Philips Respironics Dreamstation.  I went from an AHI of around 2 on therapy to 10-22.... some nights showing up to 150 central apneas.  We suspect the machine's readings are bad (did another sleep study which showed only a few events).  I'm curious if anyone else has had this issue with their device.  Unfortunately with the recall, it's taking some time to get a replacement.   Note:  I recently started using the O2 Ring to get more insight, and it is showing very few instances of O2 drop throughout the night.... that reinforces my assumption that my device is likely reporting events in error.

RE: False Increase in Apneas with Respironics - staceyburke - 09-19-2021

To help we need data from Oscar. Downloaded fee from the top of the site

RE: False Increase in Apneas with Respironics - LindanHotAir - 09-19-2021

Did you check your machine for disintegrating foam? Did you remove the foam? If there is loose foam it can block sensors. If the foam was removed and the chamber was not properly sealed and reassembled the sensors will not properly report your data.

RE: False Increase in Apneas with Respironics - SarcasticDave94 - 09-19-2021

Just think for a minute if the Centrals were real. I don't think oxygen levels drop as much with Centrals, unless there's quite a bit of them. So yes try an OSCAR shot.

RE: False Increase in Apneas with Respironics - kbauhs - 09-19-2021

Thanks!  I'll download Oscar and upload the data this week.

RE: False Increase in Apneas with Respironics - Ratchick - 09-20-2021

I think it depends Dave. I see plenty of desaturation with my centrals (depending on length, depth of sleep, etc). There's no specific reason why a central shouldn't drop your SpO2, after all - any time not spent breathing, your carbon dioxide levels are increasing and your oxygen is decreasing... it just depends how well-oxygenated your blood and tissues are to start with, how often the apneas are, and how long they last. When I'm in the early stages of sleep, my SpO2 might only drop a couple of percent because I've been breathing normally apart from those short 10-second lack-of-breaths. And if that's what you have all night, then that's maybe all you see. But they can absolutely cause much bigger desaturation.

It would be a little odd to see treatment-induced centrals after using the cpap for a while, but it could well be related if you've modified your CPAP to remove the foam, or something else isn't working right. Hopefully the chart will help.

RE: False Increase in Apneas with Respironics - SarcasticDave94 - 09-20-2021

I'm thinking it's dependent on some variables. How many CA and how long per Central. Someone with full on trainwreck CA would have more desats than one with the "used to have some and now there's more" thing.

RE: False Increase in Apneas with Respironics - Ratchick - 09-20-2021

Oh yeah of course... I would imagine that a lot of the same factors would be true with obstructive events too, is what I mean. Smile

RE: False Increase in Apneas with Respironics - SarcasticDave94 - 09-20-2021

So which trainwreck looks more like what we're dealing with?

[Image: A9EFNUY.jpg]

[Image: QOAzJ8K.jpg]

RE: False Increase in Apneas with Respironics - kbauhs - 09-20-2021

Lindan - I haven't seen any evidence of degrading foam, and I haven't taken any action to address it (other than registering for the recall with Philips).  

The weird thing is the CAs didn't show up when I took the device (without humidifier) with me on a weeklong vacation, nor when we repeated my sleep study in the clinic.  But in both instances, once back home, they showed up again.  Could be a coincidence, but it's confusing.