If you are looking for a physical attribute on the outside of your body that you can see that relates to the need for xPAP. It would be the size of ones jaw, the size of ones nose.
I wonder if the real question is whether those who need xPAP to see if there children and grandchildren might get some treatment early in life, which would allow for their jaw to grow wider and more forward, so they do not need xPAP as an adult. IE, Look to see if those babies gasp for breathe when sleeping.
Two months ago I went to see a Cardiologist. The docs nurse, who has some years experience dealing with cardiac patients, was telling me that Cardiologists had discovered that proper Sleep Apnea treatment made a huge difference to improving the quality of life for their patients. Plus, if the patient started treatment early enough, they only meeting with a Cardiologist was for a check up, the simple stress test, not; Angiograms, stents, open heart surgery, quick trips to the ER.
A trained Diabetes expert, who read the current studies on Diabetes and Sleep Apnea, told me. "There is also a huge improvement in the reduction of higher Blood Glucose and improvement for quality of life, length of life for Diabetes patients," for those with successful sleep apnea treatment.
The first line of treatment for, 'Air in the skull," or actually getting pushed into the sinuses, would be a Bi Level machine. Which Philips Respironics puts in the name of the machine, "Bi-Pap", and Resmed calls theirs a VPAP. These machines have a lower pressure on exhale than inhale can be five or more points of pressure. Usually the sleep labs do not try to diagnose with bi level pressures until the needed pressure is 12 or over. Like someone said, they can be more expensive. There are some PR Bi-Pap machines that are nearly the same price as a normal PR machines, PR machines being quite often lower than Resmed. Despite the fact a lot of people here love Resmed, many sleep doctors prefer PR machines, and not because they are less expensive. Resmed does not offer discounts of any types. Pugsy has said, "that there is not a dimes worth of difference between similar machines between PR and Resmed in how they can successfully treat Sleep Apnea." Although there are slight differences in the algorithm of the machines, which can make a big difference to some users. If you can get a good titration, then you might avoid the trap of trying to, on your own, putting the machine on Auto, as kind of an at home titration fix. That is a machine on auto can try to raise its own pressure higher, often just chasing mask leaks.
Insofar as my experience, I have a larger than normal opening between the inside of my sinuses, and the tear duct in my eye. so for a long time I used a Full Face mask rather than a nasal mask (nasal masks are far more popular). Now I use a FitLife Total face mask (the mask of the last resort) which allows me to get both my eyes, nose, mouth under the mask. The real reason I use the Total face mask is that the sides of my face are uneven. I do like that the pressure on my face is distributed over a larger area. I notice that if one does not put the mask on until starting the machine blowing, ends any sense of claustrophobia.
I suspect that you will have a different experience with your sleep doc than many of us have. Being on insurance, like Medicare, or an HMO, where the doc is pressed to run fast between many patients to make a living. Also your business ability to speak to someone and get to the important information from the doc without wasting his time will cause the doc to try to be more helpful to you. Docs may be kind to the old and disabled, they love people who work.
Whether you are using insurance or not. You will have a DME. A "Durable Medical Equipment" company which will sell your masks, hoses, filters, odds and ends related to therapy. A good DME should also help you to fit your mask, help with information. and so on. A lot of people here tell horror tales about them and their DME. Personally I have only had great experiences with DME people. Why insurances require that we deal with a brick and mortar DME rather than buy our stuff for less money from the least expensive place online relates to the fact almost fifty percent of those who get a diagnosis, titration, machine, quit. The DME is providing a rent to own machine (payments over 13 months for Medicare). The DME in conjunction with the Sleep Doctor will monitor your compliance with using the machine. The DME should be willing to give advice to make using the machine easier. If you buy the same machine online, for less money, and you need help with, how do I make this happen or that, or what is going on here, then you have no one to call. If you have a DME, then they have a phone number for you to call 24/7. The DME will put a little stickie on your machine with an1-888- number. The most often quoted resource on DME's is
http://maskarrayed.wordpress.com/what-y ... me-part-i/
which I highly suggest you read. And take Janknitz advice over mine, Janknitz knows more than I do , and usually expresses it more informatively.
What you will want to do at this stage. You will want to get a copy of your sleep apnea prescription, and the sleep study, not the whole sleep study, which would be like a huge computer listing, just the little two page sleep study summary. You can make some extra copies. Put one copy in your sleep apnea travel bag, scan one into your computer. When you travel, and you suddenly need something sleep apnea, like a hose or a mask, then one must have a prescription to get a DME to sell it to you. Getting your docs office to FAX a prescription, then you have to pick that up. If you have the "Sleep Study' summary then any GP will quickly agree to write a prescription, which you can take to a local DME.
If one only has OSA, some can get restful sleep by sleeping sitting up without a machine, but not on their backs. Like if the power goes out, you are in some other kind of situation.
BTW, do you also have GERD? It seems to be a concurrent disease.
When I first started treatment, it was like a hurricane blowing in my face. After six weeks, it was like, I think the machine must be broken, it seems to be barely blowing at all. I think many of us have been surprised by what we have gotten used to, in a lot of ways, relating to sleep apnea treatment.
As my apnea had manifested for some years, because I could not afford treatment, I had a great experience. I say it is like coming back to life. Before treatment I would wake up in the morning saying, "It can not be time to get up yet." To wow, I feel great, I have so many neat things to do today.
Your experience may not be quite so dramatic. Some say they are not getting improvement in their life while doing the treatment exactly as prescribed, then they miss a night, then they say, "Wow, I did not realize how much sharper I am on treatment, how much more energy I have on treatment, how much better I remember. Sometimes how much nicer a human being they have become on treatment.
Best wishes.