dsm wrote:
I am interested as to what you think of the transition from Inhale to Exhale on the S8 when in AUTO mode and also if you get to try the EPR feature (which turns the S8 Vantage into a mini BiLevel)
Also the noise - what does it sound like ?
OK, here's my mini-review of my first night.
I'll comment on the noise first. The machine is very, very quiet. I thought maybe there was just a very faint whistling component to the sound during inhale but my wife says all she could hear was very low-volume white noise. I think the slight whistle must have been either in my nose or in the mask. We've always run a HEPA filter thing in the bedroom at night for the white noise and she wants to start back running it tonight. It was too quiet for her last night with just the APAP machine. She said the APAP white noise changed with inhale and exhale but it reminded her of sleeping her the ocean where you can just barely hear the waves coming and going. We give it an A+ for quietness.
As for inhale to exhale, as you say it seems to have a fairly "soft" transition. My settings are 7-12 and according to the LCD this morning I averaged 10.0cm of pressure over the night. Compared to the Remstar machine they used for my titration study (5cm, 7cm, 9cm) I'd say this machine is a little easier to kind of gradually coast to a stop on the inhale and then gradually build up the exhale. That's how I normally breathe and during the titration study I felt like I had to actually
start the exhale rather than it just going naturally.
I must say, though, that it may simply be me learning how to breath more naturally with the pressure. I wouldn't be surprised if I went back to the machine I used in the titration study tonight and found that my transition was much smoother. I was really struggling against the pressure that night in the sleep lab. I have no idea whether the titration machine was set with C-flex but I doubt it.
I do have a couple problems, though. First off, according to the LCD this morning I averaged 0.82L/sec of leak. That's accumulated over 8:08 of total time yesterday including a few minutes in the DME office. I actually had the mask on from 9:44PM-5:32AM minus three short bathroom breaks. So call it 7:40 of mask time last night with the other half hour being at the DME office or when I was messing around at home after supper yesterday. So there were some really big leaks during that extra half-hour but it sure looks like I was far from leak-free overnight. I wasn't aware of any leakage around my eyes but occasionally the edge along my upper lip would let a little air seep out (I have a beard and mustache).
The worse problem is I hold my breath. It's just an irresistable habit when I'm breathing against the pressure. Especially if I'm lying awake trying to fall asleep I find myself at the end of the exhale just keeping the air out and refusing to start inhaling for a few seconds, sometime longer. It's like some sort of waking central apnea. When I notice I'm doing it I make myself go ahead and breath but my body sure doesn't like the way that pressure insists on a big inhale whether I'm ready or not. Hopefully that will be better tonight.
P.S. And BTW, I did not try the EPR since I'd have to switch to CPAP mode and all that. Sorry.