(07-01-2016, 01:27 PM)silverny1 Wrote: ........................
The oximeter came with SpO2 Assistant software to display the data and, in addition, SleepyHead can import and display the pulse oximetry data. Both software programs display information on the number, duration, etc. of two types of events: "Desaturation Events" and "Pulse Rate Events."
It should be noted that the two programs define the events slightly differently. For example, SpO2 defines defines desaturation event as a drop in SpO2 by at least 4% for a minimum duration of 10 seconds, whereas SH defines desaturation event as a drop in SpO2 by at least 3% for a minimum duration of 8 seconds. Similarly, SpO2 defines pulse rate event as a change in rate by at least 6 bpm for a minimum duration of 8 seconds, whereas SH defines a pulse rate event as a change in rate by at least 5 bpm for a minimum duration of 8 seconds.
Perhaps it should be further noted that the event parameters for SpO2 and pulse in each of those programs are configurable. So while the defaults
are unequal, they can be adjusted to equality. At least in theory. It'd be interesting to determine if that actually works to give the same readings for each.
I recently bought the CMS50i, and after three straight nights of use, I've yet to figure out how to sync its recorded data with the corresponding SH CPAP report. (I followed the links in the SH oximeter wizard intro for installing the (Win 7x64) USB to UART driver, though I don't see any such thing listed in the Windows Device Manager.) The session times in the SpO2 assistant are correct but in SH, a single oximeter session appears as multiple sessions with illogical start times, no matter how I try to adjust it. None of the on screen starting time adjustments seem to work properly.
Moreover, the CMS50i appears to be calibrated low. I have a CVS non-recording pulse oximeter, and have compared the two in real time, simultaneously using one on each hand (same finger), switching them, etc. For SpO2, the CMS50i always reads 2-4 percentage points lower than the simpler device.(!) Pulse data, on the other hand, are the same on each device. Same observations when the CMS50i is compared against an SpO2 app on my smart phone. Will start a thread about this when I have more experience and data.