Oh, and by the way, some of them (hypopneas not associated with snoring or flow limitation) are clearly NOT benign. Using the S7 at home, if I set the Auto to 16-20, it flatlines at 16. I tried this several different nights, same result. If I set it to 15-20, it varies between 15 and 16 but no higher. So it is not responding to ANYTHING above that pressure. In the lab, however, the tech could not clear all of my genuine obstrutive events without going up to 19.LoQ wrote:ResMed assumes that any hypopnea not associated with flow limitation or snoring is central. I have no way of knowing if that is true or not, but whatever, their algorithm doesn't respond to those "benign" hypopneas.
Some of the hypopneas that ResMed is measuring that we are calling benign really aren't benign, and possibly, ResMed is detecting hypopneas that need to be treated, even though ResMed doesn't, that other machines don't report. Saying you should cut the HI reported on pre-S9 machines in half is probably misguided. For any particular individual, the number of hypopneas reported by ResMed may be 100% genuine, 100% over-reported, or somewhere in between, but it is probably not 50% for the vast majority of people.