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sleeptech

sleeptech
Joined Jun 2017
sleeptech
Joined Jun 2017

I can tell you that from a mechanical point of view, and backed up by mountains of research, CPAP does not increase the amount of air you breathe. It opens you airway, but the amount of air moving in and out of your lungs (your tidal volume) is unchanged and is purely determined by the work of your muscles. I know this sounds counter intuitive, but CPAP is a CONSTANT pressure system. There is an in flow and an out flow, keeping the pressure in your airway constant. The amount of air that moves in and out of your lungs is determined by a CHANGE in pressure caused when your muscles work to either expand or contract your lungs. This is not changed by CPAP. Think of it like this: when you jump you change your elevation (if only a little bit). Now whether you stand on the ground floor of a building and jump, or on the top floor of a building (starting at a higher elevation) and jump, the height you can jump is the same. You may start and finish at a higher or lower level, but the change in your elevation due to the jump is the same.

That does not mean that cold air from CPAP can't make you feel cold, it just doesn't do it because you are breathing more air. There may well be some aspect of CPAP use that causes hypothermia in some patients, but I seriously doubt that it simply because of the amount of cold air they are breathing. Largely because without CPAP they would be breathing the same amount of air at the same temperature as they do with it. Also, a good humidifier can make the air warmer than it is in the room around you. It is more likely that some internal biological imbalance is causing the hypothermia. I'm afraid I haven't heard anything about this before. But I do know that CPAP only removes an obstruction from your airway. It does not change the amount of air you lungs push in and out.

The size of the drop in your oxygen is only a part of the story, and not the most important part. Even with only a small dip in oxygen saturation, if there is an EEG arousal (i.e. interference with what your brain is trying to do in sleep) it can still be damaging to both your quality of life and your health.

It is possible that you have positional OSA that is much worse on your back. The fact that you slept so we'll with the Auto SV BiPAP may or may not be significant. The Auto SV can be set in a number of modes and I assume that you don't know how it was set when it worked for you.

With such limited info I really have no idea exactly what is happening in your case. If I were you I would keep working with your health professionals but make sure that you drill them for information as much as you can. Make sure that they explain to you what they are doing and why. It can be very complicated to nail down the exact cause of sleep related respiratory disturbance in some cases (trust me) but there is a structured way to approach it. If there is a range of different people working on your case it can be easy for the process to get confused as each person only has part of the story. You need to be the one who keeps everything working logically and together in a sensible direction, because you can't always rely on others to do it for you (even if that's their job).

In short, educate yourself a bit and make sure everyone explains what they are doing at every step. Ask questions. Good doctors will be happy to answer them and involve you in the process.