barry15 wrote:I recently got a Respironics System One Auto machine, and I notice that in the daily report, AHI is composed of three things – Obstructive Airway Apneas (OA), Hyponeas (H), and Clear Airway Apneas (CA).
My first question is this – is Clear Airway Apnea just another term for Central Apnea? I don’t see anyone except Respironics using the Clear Airway Apnea terminology, even with a Google search. I like the fact that this machine claims to be able to distinguish CA’s from OA’s, which is something that my old Resmed Autoset II didn’t do. They say that they don’t make any change to the pressure due to CA’s, but they do report them and they are included in the AHI.
I have been varying various factors, including the “flex” settings (A-Flex, C-Flex, and no Flex) and the pressure limits (slightly).
I have also been trying both my Ultra Mirage nasal mask and my Ultra Mirage II full face mask. The preliminary data seems to show that my OA index is more or less the same under any scenario (about 0.5 on average), my H index is about the same also (about 1.7 on average), but my CA index is higher with the full face mask (about 2.3 rather than about 0.5 for the nasal mask.
My second question is this – is this significant? Does it matter? To look at it more broadly, my AHI is about 2.5 with the nasal mask and about 5 with the full face mask. I plan to continue to collect data, to separate all the various variables, but can anyone give me any insight about this seeming difference between the full face mask and the nasal mask? Is there some reason that the full face mask should cause more CA’s, or is it likely just the effect of how the machine distinguishes a CA (by sending out several puffs of air when it detects an apnea)? Even if it is the latter, the AHI is still almost twice as high with the full face mask, so it makes me wonder. I have nasal issues, and the full face mask is more comfortable for me, but I don’t want to compromise my therapy if it matters.
This might sound like a very picky, technical question, but I have noticed that there are some very knowledgeable people here, and I thought I would see if I could gain some insight.
Before anyone asks, I don’t have the Encore Pro 2 software yet, but my sleep doctor’s office is very cooperative and less than five minutes away. They will gladly print me out my data every week at no charge, so I have been getting the information that way.
Without knowing your pressure those numbers mean nothing. Leak and Pressure should always be used together. Including which mask make/model is even more, even more meaningful.barry15 wrote:My leak rate has been very consistently about 30, with a range from about 28 to about 37. As I understand it, that is fine. If not, please let me know.
GumbyCT wrote:Without knowing your pressure those numbers mean nothing. Leak and Pressure should always be used together. Including which mask make/model is even more, even more meaningful.barry15 wrote:My leak rate has been very consistently about 30, with a range from about 28 to about 37. As I understand it, that is fine. If not, please let me know.
EDIT: a detailed graph of the pressures and leak are even more, even more meaningful. A graph will show spikes you won't see looking at just numbers, spikes can lead to events when the pressure drops due to leaks. Leaks and pressure should always be used together.
FeistyWifey wrote:Barry, there is no insignificant question. Ask, ask, ask. (Besides, nobody can ask more teeniney questions than I do, and I can't articulate the way you do). People on this Forum have been wonderful to us. You will be very happy here. Congratulations on the weight loss -- that's tough to do in my experience!
I'm just throwing this question out there to all the guys with beards (and my husband has a beautiful beard so I'd like to know for myself as well): could it be that the beard is affecting the seal of the full face mask when it might not do that with the nasal mask? If so, what methods could be used to deal with any possible leaks -- taping, Pap Cap, any other tips?
|Machine: S9 AutoSet™ CPAP Machine|
|Mask: Hybrid Full Face CPAP Mask with Nasal Pillows and Headgear|
|Humidifier: HumidAire H4i™ Heated Humidifier|
|Additional Comments: Started 8/07, S8 Escape set to 11 then 9, ramp 8 then 6...losing wt is working for me. APAP range 9.8-16.|
rested gal wrote:In a reply titled "Nope" sleepydave (RRT, RPSGT and manager of an accredited sleep center) responds to honda's question:
The pathophysiology of obstructive sleep apnea and central sleep apnea overlap considerably. During normal inspiration, neuronal discharge to the diaphragm and dilator muscles of the pharynx increases. Failure to achieve pharyngeal dilatation in the presence of diaphragmatic contraction results in an obstructive apnea. If the diaphragmatic contractions are diminished, a central sleep apnea occurs. The hypopharynx may or may not be open during a central apnea. Studies have shown considerable narrowing of the hypopharynx during a central apneic event. If the hypopharynx is closed during central apnea and diaphragmatic activity resumes before pharyngeal dilator muscle tone is restored, a mixed apnea results.
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