(01-31-2014, 02:09 AM)robysue Wrote:(01-30-2014, 04:51 PM)justMongo Wrote: I am only able to read out my AHI and AI. (I have the custom data card and reader for the S8 -- but, cannot get things to play nice.)The HI = AHI = AI, so if your AHI > 5 and your AI is around 2, then the HI is at 3 or higher.
My AHI exceeds 5. My AI is about 2.
Quote:So, I conclude that my Hypos are pushing my AHI above 5.That's a reasonable conclusion. You might want to up just the IPAP by a cm or two and leave it there for a week or so to see what happens to the AHI and the AI (and hence the HI).
Quote:Looking at my 4 year old titration data, I showed occasional CA's at higher pressures. As I look at that data, I don't understand why they settled on 14/9. Other, than I think they were running out of time.If you look at the data carefully, you will notice that 14/9 appears to be high enough to control the OAs and the Hs (the #OAs = 0 and #Hs = 0), although it looks as though you got mighty little sleep at that pressure setting. Above IPAP = 14 and EPAP = 9, you'll notice that the number of centrals grows with the pressures. That's probably why they didn't go with a higher pressure setting.
In my non-sleep professional, non-doctor view, I think the question to ask is why didn't they just go with a pressure setting of 13/6. Your sleep efficiency was good and there were no obstructive events in the 21 minutes at that pressure. Or perhaps 13/7 when you had 40 minutes of REM sleep with no obstructive events. (But there were 3 CAs in the 57 minutes at 13/7.)
Out of curiosity: Have you ever tried sleeping at 13/7 or 13/6 to see if the AHI goes down instead of up??
And by the way, those ridiculously high AHIs based on 1-3 CAs at pressures of 15/8, 15/10, 15/11, and 17/10 are based on ridiculously small amounts of sleep. For example, let's look at the AHI computation for 15/8. There's one CA scored at 15/8, but the reported AHI = 150. Here's how that number was computed:
According to the data, they had you at 15/8 for a whopping 3.8 minutes. And your sleep efficiency at 15/8 is reported as 10.5%. In other words, you were only asleep for 10.5% of the 3.8 minutes that the pressure was at 15/8. And 10.5% of 3.8 minutes is a grand total of 0.339 minutes, which equals 23.94 seconds. Let's round that to 24 seconds and note that 24 seconds = 0.4 minutes, and 0.4 minutes is 10.52% of 3.8 minutes. So it's likely that at a pressure setting of 15/8, you slept for a whopping 24 seconds. And in those 24 seconds you had one central apnea. Since AHI for 15/8 is equal to (# of events)/(Sleep time at 15/8 measured in [i]hours[/], we first have to convert the 24 seconds of sleep time to hours:
24 seconds = 24/60 minutes = 0.4 minutes = 0.4/60 hours = 0.00667 hours of sleep at 15/8 cm.
So the AHI at 15/8 is scored as:
(1 CA)/(0.00667 hours of sleep at 15/8) = 150.0 when rounded to one decimal place.
And finally, was this a split study? There are only 3 hours of time recorded in the pressure data. Did they have you sleep without the mask for the first part of the night and then wake you up to put the mask on your nose for the rest of the night?
Yes, this was a split night study. It took me quite some time to initiate sleep that night. When switched over to the titration phase, I think little time was left. For some reason, I did desaturate badly during REM sleep. Since my PSAO2 was low throughout the study, my Rx calls for 2 LPM O2 to be injected into my xPAP flow.