Uncle_Bob wrote: . . . trying to get my head around the "range" idea and why some people prefer either narrow or wide pressure ranges. . .
My understanding is that a number of experienced users here (meaning much more experienced than I am) have discovered that having the minimum up within a cm or two of what is needed to stop obstructive apneas seems to allow the autos to be more effective in preventing events for many and seems to be more comfortable for them.
This is not a concept that many sleep doctors or manufacturers are on board with, though. Manufacturers sell their autos to be run with a wide open range, 4-25, and that is what most sleep docs mean by "using an auto." To them, one of the main purposes of an auto is to not have to titrate. The self-titrators on this board, on the other hand, have found that they can tweak some extra effectiveness and comfort out of their autos by raising their own minimum.
Keeping the maximum at the maximum that the machine allows, as has been stated, is not really a problem for most with plain vanilla OSA, unless a machine tends to run away in the sense of continuing to raise pressure to an uncomfortable level for no good reason. Someone with a tendency toward pressure-related centrals or who has been prescribed a CPAP to treat centrals along with their obstructive events may have a good reason for keeping the maximum low and running in a very narrow range. Personally, I think straight CPAP might be better for someone doing that, though, in many cases.
That is my understanding as a patient in trying to trace the history of things stated on this board.
jeff
ps- See, I can be on-topic when I
have to be!