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Very long hypopneas -
#1
Very long hypopneas -
Looking at my OSCAR data for last night, I noticed some very long hypopneas, 40 and 48 seconds(!) respectively. I woke up today with a severe feeling of soreness and tightness in my windpipe that persisted the whole day, and worse headaches than usual. Checking back through my data, there was a similar event 2 days ago and in the preceding days. I note the machine did not increase pressure (on the pressure graph) but did do several pressure pulses. It was like it wasn't responding to the event.

Anyone have any thoughts on this? That is a disturbingly long time to not be breathing.


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#2
RE: Very long hypopneas -
How do you know how long the hypopnea were?

In my OSCAR, the "events" tab tells me how many hypopneas occurred and what time, but not the length. In my case, the time is like 03:33:59 which means the time is expressed in hours, minutes and seconds --3:33am and 59 seconds. It does NOT mean the hypopnea lasted for 59 seconds. My machine is a ResMed and yours is a Phillips. Maybe that is the reason.

To reiterate, how do you know the length of the hypopnea?
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#3
RE: Very long hypopneas -
IIRC, the Respionics machines report the length of hypopneas. They would show up in the Events tab of the left column.
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#4
RE: Very long hypopneas -
True OSCAR does not provide duration of Hypopneas, a metric that is very important in the Sleep Apnea recent literature.
I have used a caliper to manually measure the length of a hypopnea, as provided by OSCAR.
  Now I am aware we can discuss the accuracy of where I assume the episode begins and end. But I will state that the measurement is close enough to be useful.  We all have seen that OSCAR is quite variable in where it decides to mark many respiratory events.
  It measures duration for Apnea so why not for Hypopnea (and RERAs)?
One gross way I have used to measure my accuracy is doing the same for apnea and comparing OSCAR and my results.
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#5
RE: Very long hypopneas -
It is the CPAP brand that does not report hypopnea durations, not OSCAR. OSCAR will only report the data the CPAP provides.

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#6
RE: Very long hypopneas -
(09-17-2022, 09:43 AM)SleepyHenry2 Wrote: True OSCAR does not provide ...

You don't seem to understand what OSCAR does and doesn't report.

OSCAR reports what the machine reports, it doesn't fill in the gaps and report what it believes some items to be.

OSCAR reports the Hypopnea time length on DreamStations, because DreamStations report Hypopnea lengths.
OSCAR doesn't report Hypopnea time lengths on ResMed Air devices because Air devices don't report Hypopnea length.

This OSCAR design choice is important to help give OSCAR credibility and have its reports accepedt as being what the devices actually report.
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#7
RE: Very long hypopneas -
I was getting the length of hypopnea by looking at how long the flow rate was at ZERO (and also respiration rate sharply declining). This is visible in the 2nd and 3rd pictures I attached. I cannot comment on how OSCAR/various CPAPs work in reporting length of event.

Per my original question - that seems to be a very concerning event length. Is this something to worry about? Thoughts on addressing this? Thanks
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#8
RE: Very long hypopneas -
Thank you.
I stand corrected...ResMed's algorithm does not provide to OSCAR the duration of Hypopnea.
But the question still remains about the “need” for such a metric.
Friends, I am not an engineer or software savvy, so pardon my ignorance when I ask can we do it?
Can OSCAR provide us with this measure, or is it too hard and long to try it?
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#9
RE: Very long hypopneas -
Both hypopnea in your zoomed images are breath-hold. There is a large inspiration which reaches zero flow (no exhale) and at the end of the breathing pause or breath-hold, you finally exhale. This is not an event. You are either dreaming of being a champion pearl diver, or moving in your sleep and holding your breath. A 30-40 minute breath-hold following full inspiration is impressive in a breath holding contest, but not that unusual at night. I think it's interesting that the Philps CPAP distinguished the breathing cessation from an apnea and labeled is appropriately as a hypopnea. Note each one has three pressure pulses.
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#10
RE: Very long hypopneas -
>>>A 30-40 minute breath-hold

Did you mean 30-40 seconds ?? Which is what the charts show.
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