We recently purchased a Dream Station Auto from the US and my wife has been using it for the past three weeks. We left the machine wide open (4-20) as we didn't see any harm and she had used a hire one wide open with no problems. The sleep doctor at the hospital gave her a prescription for a Fixed machine set to 8cm just in case we needed it to buy a machine. He didn't see auto as a necessity, he also said that the 8cm was his best guess based on his inspection. This fit with the report from the previous hire machine that the 90% average was 7.5cm
My wife recently went to the GP complaining that she was dizzy and had chest pain. The GP ordered blood tests etc. When I got home I thought I should check her machine just in case it was too much oxygen. The machine showed that her 90% average was 10.9cm. I did notice a few of the settings had changed since I set it up e.g. the modem was turned on even though I turned it off as it will not work in Australia. I am not sure if this was our two year old who enjoys pressing buttons. All of the pressure settings looked how I expected them to be. My wife's next consultation with the sleep specialist is not for 6 months.
What if any are the symptoms of having the pressure on the machine too high? Is there anything that might cause the 90% pressure to rise like that over a short period of time? Is it wise to keep using the machine the way it is? Should we bring the pressure limit down?
Any thoughts would be appreciated. I will also get the wife to discuss it with the GP next time we see her, although she has previously mentioned that she is not familiar with Sleep Aponea and not had a patient with it in the past.