OK, so, first and foremost, I'm not a Dr.
I'm just telling you the bit that I know. For a central apnea to occur, your brain stem does not send the signal required for you to breathe. This is, of course, very different from an obstructive apnea during which your throat is physically closed such that the air can't get through.
My Dr. explained pressure-induced central apnea like this: if you are in the car, travelling fast, and stick your head out the window, the force of the air hitting you in the face is enough to cause some O2 overload such that your brain does not send the signal for you to breath as regularly as it would if your head was NOT hanging out the window. The high CPAP pressure is no different than this. Centrals will happen and, he said, are not that big a deal because we will, eventually, take a breath when needed. Unfortunately, these centrals can cause micro-arousals which, are not good because they fracture your sleep. He told me that the patient can get used to the higher pressure and the number of centrals will reduce.
Some folk do have central apneas that occur because there is something going on in their brain stem such that the signal to breath does not get initiated. These folk are treated with a bi-pap that has a back-up rate; the machine tracks the number of breaths and initiates a breath if the patient does not breath appropriately. If you did not have centrals showing up at lower pressure, then, in all liklihood, this scenario does not apply to you.
I had a ton of centrals showing up during my first titration study when they had me at a pressure of 15. These reduced significantly over time and, when I lost some weight and was able to be at a lower pressure, they dropped down to only a few during the night. You should bear in mind that anybody (this includes non-OSA folk) can have central apneas during the night; this is considered normal.
If you are using an autopap, take a good look at the number of centrals that it thinks are happening. Hopefully, you will find them decreasing over time.
Buy a new hat, drink a good wine, treat yourself, and someone you love, to a new bauble, live while you are alive... you never know when the mid-town bus is going to have your name written across its front bumper!