(03-13-2013 10:53 AM)BryanB Wrote: What I am experiencing, when it first turns on, it blows very hard, I guess checking for mask air leaks? Then it 'calms' down, and seems to run at the minimum setting of 4.
Are you turning it on using "mask fit" (holding the knob button down for 3 seconds) or are you turning it on straight to therapy (tapping power button)? If you are turning it on using the "mask fit" feature, then what you are describing makes sense. With "mask fit" the machine delivers 95% pressure from its last use. 95% pressure is the pressure the machine ran at or below 95% of the time. So if it is getting to 10.4 or above, then your 95% pressure would probably be somewhere at the high end of the range 4 through 10.
Masks need to be adusted for the pressure range they will be used at. So if you adjust your mask at 4 and then your pressure gets up to 10, you'll likely get a lot of leaks. The Quattro FX is pretty sensitive to wide swings in pressure. This is why you have the "mask fit" feature. Adjust the mask at the higher pressure delivered during the "mask fit" period. Then when the pressure goes down the mask may feel tight, but the pressure will probably get back up there as soon as you fall asleep anyway.
Quote:This seems to be comfortable to start. I've worn the machine for the last few nights, although I can only take it for about an hour or two, I am in the process of getting some climateline tubing so I can use the humidifier, it is just drying me out so bad I cant take more than an hour or two at this point.
I highly recommend good humidification. What do you have your humidity set to? If you aren't already having issues with rain-out (condensation in hose), you can try raising the humidity level a little at a time (humidity setting is the water drop icon. Sets off and 1 - 5, 5 is max) until you start getting condensation. When getting condensation in hose, you can either back off humidity level or find a way to insulate the hose from cooler air - hose cover, hose snuggy etc. I do recommend going ahead and getting the ClimateLine though. It really helps eliminate rain-out while providing high humidity.
Quote:But, i'm not sure if I have drifted to sleep and not noticed it, or what, but it starts to get much higher pressure, last night, after about an hour and a half, I noticed, it was blowing so hard into the mask, I was getting significant air leaks, that I was not getting at lower pressures, and when I pushed the button on the machine, it showed at that point, it was at 10.4. With it blowing that hard, I found, it was feeling like it was 'blowing' my mouth open, as though I had my head sticking out a car window going down the highway. Obviously, this is not going to be comfortable. Is this 'normal'?
Yes, it's "normal", but not desirable. The pressure feels much worse when the mask doesn't have a good seal on your face. Things will get much better when you get the mask adjusted to withstand the higher pressure so it doesn't leak like that.
Quote:Is there a 'normal' range of pressure? Since we did not have settings, we basically had the unit set for full auto mode, with full range from 4 to 20, this was only at 10.4, I cant imagine what 20 is like?! I do not have ramping turned on currently, so I don't believe that had anything to do with it either.
There isn't really any "normal" pressure. Under these circumstances it would probably be a good idea to let the machine find the right pressure. I recommend downloading ResScan (software you can use to download the ResMed SD card data to your computer and review details of treatment) and keeping track of what's happening. You could download Sleepy Head also/instead, but it has gotten awful "buggy" lately and probably wouldn't be good to start out with. Then as you start to see what's happening through the night, you can start closing in on a tighter pressure range. Tighter pressure ranges help eliminate leaks a lot - especially with the Quattro FX.
10.4 isn't an unusual pressure and doesn't feel near as bad when the mask is sealed; but, it will feel like pressure. Keep at it and you will get used to it. Especially once you get those leaks under control. I know it seems like a lot of pressure, but after a while (when leaks are under control and the humidity level is set right) you will likely wake up one day and not be able to tell the machine is on. You may even start to like the pressure.
Like you, I started out with a machine set to wide-open (4-20).
After weeks of keeping an eye on average and 95% pressure the machine was using to prevent apneas and hypopneas in order to narrow my pressure range down, I now have it set to 17 - 20. I know it may sound hard for you to believe, but I barely notice the pressure when I put my mask on now and when I wake up in the morning I have to put my hand in front of the mask vent in order to verify that the machine is still on.
Just hang in there and don't hesitate to come back to this forum with any other questions.