(04-25-2016 12:26 AM)Luvmyzzz Wrote: It seems a bit odd that the manufacturers would be still using the "old" specs/algorithms , when health care has been telling patients to "replace the machine every 5 years" does anyone see a glitch here or am I over thinking this awkward scenario??
Manufacturers put a lot of effort into developing the major parts of their algorithms a long time ago. They make modifications to the algorithms, with the biggest ones being detection of CAs, but the underlying "philosophy" that the company started designing their APAP algorithm with a decade or more ago still underlies the current algorithms in very important ways.
In particular, if you compare the pressure curves of Resmed S8, S9, and A10s there is not a lot of difference. If you compare the pressure curves of PR M-Series, System Ones, and DreamStations there is not a lot of difference. And the differences you see in both families are due to the introduction of CA detection: Once CAs can be detected, it changes the rules of how the APAPs react to OAs and CAs, and not much else.
But if you compare the pressure curve of a Resmed S9/A10 to the pressure curve of a PR System One/DreamStation, there are a lot of differences. And they're by and large the same differences that were present back in the days of the Resmed S8 and Resprionics M-Series. The S8 responded aggressively to clusters of apneas and flow limitations and the pressure curve had the same "crested wave" shape that the A10 has today. The M-Series ran the Search algorithm and responded more slowly to apneas and hypopneas, but perhaps more aggressively to snoring; and the M-Series pressure curve had the same saw-toothed shape that the DreamStation has today.
As for why new machines are recommended every five years: First of all, things do wear out eventually. And replacing the machine at that first five year cycle gives a way of providing a backup machine for a lot of us who can't really afford to buy a backup out-of-pocket. But also a lot of effort has been put into making CPAPs more comfortable
than they used to be. Heated humidifiers were once a rarity; now all machines have a heated humidifier as a standard part of the package. Integrated heated hoses are more common now than they were even five years ago. Most of the time the new generation of CPAP is smaller, lighter, and quieter than the previous generation, and that's a big consideration for some folks. Slowly, manufacturers are increasing the amount of data that even the bricks provide. (I think the Airsense 10 CPAP brick reports at least summary leak and AHI data. Someone correct me if I'm wrong.) And the tools needed to read the data have changed: The M-Series and S8 used proprietary cards for data collection; the early S9s and System Ones only had SD cards; now wireless modem connections seem to be standard equipment along with the SD card. (Personally I dread the day when they quit putting SD cards into the machine because I think it will make it harder for us to get at all
the data our machines gather.)