Purchased the CMS-50D+ last week from Supplier #19
for $81 including shipping and bonus pedometer which was a nice surprise:
Arrived shortly thereafter (as compared to the response to my calls to CPAP machine DME provider, sleep specialist, and insurance, whom I have called approx 3 times each with zero results so far).
I have used the CMS-50D+ for two nights now (despite legal-eze instructions advising not to use for more than 2 hours at a time despite 24 hour recording capability!). I am very impressed. This is a high quality product for the price and origin, although the software is definitely bare-bones and not the most user friendly (for example, there is absolutely no way to supply a time offset so recording time always starts at 0 hours and ends up wherever you turn the machine off NOTE: I discovered by accident that the onboard clock works perfectly but only if you start monitoring at exactly midnight! :-) ). Wearing it for more than 2 hours is likely quite safe as to the best of my reading the light emitted is Infrared, not ionizing Ultraviolet, and therefore unlikely to cause skin damage.
Overall, I am very impressed with the quality of the construction (no iPhone cool, but appears well made for a plastic gizmo and the color screen is beautiful and clear as well as easy to navigate as long as you remember that there are two kinds of ways to push the button: A short "click" and a long "press". They do different things, but if you can navigate a TV remote, you can navigate this.
Also, turning on the recording function and remembering to turn it off are important, but easy to do in the on screen menu. It seems to be necessary to have record function on to download the data, but I may be wrong on that as it might have been getting ready to download the data before I switched the record function back on while connected to the USB port of my computer.
The Oximeter is comfortable. I did not use a rubber band or anything to hold it on my middle finger (first night) or ring finger (second night). The second night I woke with it off, but I was dreaming I was taking it off, so I think that pre-sleep self suggestion should work to keep it on. I would not want to have too much more pressure on my finger and if necessary might simply use some surgical tape on the sides or something, although they recommend NOT taping it. A near ideal method to hold it on would be one of those net tube net type bandage elastic finger covers that could go around the device and be tied to the palm of the hand, but I don't have any now that I'm not actively practicing.
I'm using rechargable NiMH AA batteries. Have used a new set each night so do not know how long it would last without them. Device came with non-rechargeable batteries taped on the outside which was a nice touch.
The supplier (#19 as above) sent me a nice email with links to the manuals for this device on their website, along with instructions of which programs to use for Windows XP vs. Windows 7. I have only tried on my XP machine. I may compare on my Windows 7 notebook soon and report back.
The manual is definitely written by a non-native speaker, but I found it very well written and easy to understand, perhaps because I was expecting much worse based on prior reviews and I am somewhat technically savvy. There were a few choice phrases which were a bit humorous*, but the intention was clear and otherwise very useful.
(*my favorite example is "In addition, pay attention to the use of the hanging rope, do not wear it around the neck on the purpose of avoiding harm to the patient".)
So far (two days use) I would recommend this device, especially since there is apparently nothing else out there that comes close in this price range.
Bottom line: I would buy it again knowing what I know now.
On a personal note:
The first night provided valuable if somewhat disturbing information: towards morning (but before awakening if I am offsetting the time right) my SpO2 went down twice, once to 80, and the other time to about 88. Both were accompanied by remarkable tachycardic increase pulse rate to 100 and 120 respectively. This also corresponded to my awakening with a sensation of shortness of breath and running a marathon.
My lowest heart rate was 41 and I am not currently athletic. Looking into the causes of bradycardia was not exactly comforting (cardiomyopathy etc listed as causes) but also obstructive sleep apnea. This low number corresponds with the 42 I got from a screening EKG recently which I need to follow-up with my cardiologist.
Curious how many have Sleep Apnea induced bradycardia here?
Last night, my Pulse Ox stats were much better -- no desaturations and no tachycardia.
Looks like I am due for a sleep study, but the lack of consistency and repeatability of the first result may limit the effectiveness of said study.