ResScan 3.5 ?

If an apnea has a blue dash at the bottom does this mean it probably started as a hypopnea and then got worse and became an apnea? I had an hour last night with about 30 events and ALL of the apneas had the blue hypopnea dash at the bottom.

Mine looks the same. I guess by definition a hypoxia is reduction in air by 50% or more for X about of time, so technically an apnea would an extreme hypoxia . I imagine it's just how the software was coded and how the unit crunches numbers.

As ResMed defines the events . . .

An apnea is defined as a greater than 75% decrease in ventilation. The device
algorithm scores an apnea if the two-second moving average ventilation drops
below 25% of the recent time average (time constant 100 seconds) for at least
10 consecutive seconds. A hypopnea is defined as a 50% to 75% drop in
ventilation. A hypopnea is scored if the 10-second moving average ventilation drops
to between 25% to 50% of the recent mean for at least 10 consecutive seconds.
Definition of apneas and hypopneas is based on the patient flow signal . . .

Although a 75% decrease in air flow can occur suddenly, it seems often to be preceded by a decrease in air flow that the ResMed will score as a hypopnea (50% to 75%). So, yeah, I would think that an event that happened gradually would show up as a hypopnea followed by an apnea, according to those definitions, since that would be consistent with a throat becoming narrower for a moment before it closes, or virtually closes. But remember that the numbers given by any machine are not quite the same as what the numbers would be in a PSG study. The numbers are estimates based solely on air flow.

Thanks for the replies. I have good nights at 10 with no apneas and a lot hi, then last night had ahi of 7.7 and ai of 2.5. I am just so tired of being tired and not consistently having good nights and feeling rested everyday,

2girlsmom wrote:Thanks for the replies. I have good nights at 10 with no apneas and a lot hi, then last night had ahi of 7.7 and ai of 2.5. I am just so tired of being tired and not consistently having good nights and feeling rested everyday,

As a matter of interest, did you look at the data at all by selecting 30 min window in ResScan - often events that look connected in the 8 hr view will seperate into differently scored events ?

Just a thought - other than that JNK has nailed it

Cheers

DSM

I always examine the data at 1hr and then go down to 30min if it's still cluttered. I literally had 30 events in an hour last night. Now some hours nothing happened, but with me having severe OSA in rem this concerns me. I have had 2 PSG recently with no bad times like this. It's frustrating. Thgey say they will Rx an auto if I am not feeling rested after a week at my old pressure of 10 again.

Yes it is frustrating. I've been on CPAP about 2 months now and am always tired too. Funny thing is, before CPAP I actually felt pretty good! High energy level, long hours at work, long hours at home on projects and hobbies, etc. My sleep was very broken, waking up about every hour or two, but generally felt pretty good during the day. Still waking frequently so not much has changed, except now I can go back to sleep easier. Now, during the day all I want to do is sit down. My job has me traveling about every week and living out of a hotel. Before CPAP on weekends I turned into a "weekend warrior" and was outside all the time, or in my workshop working on something. Now, I couldn't care less about any of that. Zero interest in any of my hobbies or things I used to work on in my free time. Frustrating indeed!

I track my data daily too and some nights are definitely better than others. I finally got the leaks under control so now I can focus on the Events. I meet with my doctor again in December and am thinking about discussing APAP.

Hope we both find a solution that gets us more rest! I did NOT feel good before CPAP, that is what brought me to the doctor in the first place. After all my bloodwork came back normal he sent me for a sleep study. I humored him, just sure apnea wasn't it but it was. I am somewhat better rested but I truly believe it can and should be better than this. Good luck to you!

2girlsmom, i can't remember anymore (read too many posts recently), but have you used an overnight pulse-ox as well? Just to see if and how much you might be desaturating in O2? I guess to you and me that's probaby pretty obvious, but it might strengthen your argument for the Auto (or the fact that the therapy's just not working as is).
Will you be able to get the detailed results of your sleep study from last week?
Am I remembering correctly that you had 3 titrations? The first was said 10cm, the second one 14cm, and this last on 10cm again?

I have had a total of 3. One was in 10/07 when I was first put on CPAP. The second was in Sept and the third last week. I need to call medical records as my form stated I wanted the full report. The thing that worries me with an overnight o2 test is some nights I have NO apneas, but like last night AHI was 10 with AI of around 5, with them mainly in one cluster. One hour where I had tons and tons of them. Scares me to death. Why can't they see this at a PSG? I know I am not feeling right. /I know the apneas have to be right even if the hypopneas are overcounted. I cannot afford to go buy an oximeter, and I'm afraid I'll have a good night if they order one night. Sigh...