Different pressure on different machines?

After five years on a Weinmann APAP, I have just moved to a new ResMed Air Sense 10. I'm getting completely different numeric results:

• On both machines, I'm have about 3-6 obstructive apnea events per hour. But, the Weinmann also reported 5-15 Central events per hour
• With pressure range set to 4-14, the Weinmann kept me at 90% under 10. The ResMed has me up at 14 for large parts of the night.

Is it normal to see such differences between machines? Or might this mean that something is wrong with the sensing or settings on the new machine?

Hard to say; you introduced several factors into the mix and I suggest you have another sleep study done and the new machine set to the prescription that results. It is entirely possible that after 5 years of treatment your needs for positive air pressure to mitigate your apnea have changed. I think the sleep doctor or your physician had best look at the central apnea issue more closely. This is probably beyond forum help as far as interpretation goes.

Not familiar with the German-made Weinmann or if there is actually any comparison of metrics between different manufacturers. Not sure if there are standards for this industry or if the standards are international. Perhaps one of our professionals would know this type answer. I am guessing here but a DME probably will not have any inkling either. Just seems logical if you have a prescription for 10, it should work for you the same way regardless but if it doesn't, 10 may be a different value in two different manufacturing countries. Dunno... Good luck and keep us informed if you find out anything.

I am not familiar with the Weinmann either. I would think the Weinmann has it's own algorithms for tracking respiratory events, just like the ResMed does. Generally though, doctors would like to have the number of respiratory events under 5 an hour.