First, kudos on the weight loss.
If you are on an autoPAP machine, there is probably little harm in staying on it as the machine will adjust down to compensate for the lower resistance from your weight loss. If, however, you are on a fixed pressure, there might be some danger in developing central sleep apnea if you stay on it. Basically, it involves your brain failing to send out the signal to breathe because of excessive pressure. It relates to the mammalian dive reflex. I am Board Certified in ENT and in Sleep Medicine, and I can barely understand it.
Central Sleep Apnea during CPAPThere is also the possibility that, if you did a home sleep test, you still have some mild sleep apnea. Home sleep tests are great, but they can underestimate sleep apnea because of overestimating the amount of time spent in sleep (good at picking up events - the numerator - but not as good as determining time spent in sleep - the denominator).
Just my opinion, but that's how I would determine whether to stay on the machine after your negative study or ditch it. Most of all, again, congratulations on the weight loss.
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