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Moe-jo: you're one of the very few patients out there to have been diagnosed by an at-home sleep study. would you mind posting a separate thread on how you made the choice, whether it was your doctor's idea, how much your insurance covered, etc? i think it would be very interesting for folks on the forum to hear more about your experience.
Moe-jo said:I was diagnosed by an at-home sleep study. I wore a little machine called a WatchPAT 200. I haven't seen this mentioned elsewhere in this forum in my reading so far. I thought it was very cool.
Tags:
Part of my assessment letter reads:
"These are called respiratory effort related arousals (RERA's) and are picked up by the WatchPat unit in the Respiratory Disturbance Index (RDI). RDI's greater than 10 events per hour in the presence of a normal AHI constitutes a condition known as Upper Airway Resistance Syndrome (UARS)."
Obviously - I didn't have a normal AHI, nor do I know how the device measured the RDI. My AHI was 20.9. My RDI was 23.7.
I am not adding this information in defense of my test or the process, or the clinic I attended. I am not entering into any debate on the subject, nor, am I offering any opinion, one way or the other. I'm just parroting this for information in case anyone is interested.
Rock, with respect to my sleep journey, I went from referral- to test- to diagnosis and treatment in fewer than four weeks. My AHI went immediately from 20.9 to a consistent number around 2, my large leak number is always 0. I know this is a lifelong process, but so far, I'm pretty happy with the pace. :-)
I don't know how the WatchPAT 200 detects UARS, I simply refer to an earlier article by David E. Lawler, and his Website.
A difference could be that the PSG equipment is set to only counting apneas and Hypopneas from 10 seconds and upwards.
As far as I know the only way to detect UARS by a PSG, is combining with a PES measurement. (Pressure in the Esophageal). This is done by a little balloon in the Esophageal. This is not a procedure used with a normal PSG.
Henning
Cindy Brown said:
The biggest reason I'm responding is the statement that the WatchPAT 200 can detect UARS that can't be detected in the lab unless there is the application of special gauges. I don't see how one can detect the narrowing of the airway or the increased work of breathing with a snore mic, position sensor, pulse ox and "pat probe". I'm not even sure what the pat probe does.
PAT (peripheral vascular tonometry) measures digital vascular tone. WatchPAT searches for reduction in PAT amplitude, indicating increased digital vasoconstriction. This is an "autonomic arousal" (vs the "cortical arousal" of EEG). It cannot definitively diagnose UARS, it can only indicate high probability. Also, it cannot diferentiate between obstructive, central and/or mixed events (probability is determined by presence or absence of snoring). CompSAS will totally baffle it.
UARS can be effectively diagnosed using nasal presure transducers with respiratory inductance plethysmography.
mollete
Nice chart at bottom of page 453.
http://books.google.com/books?id=ZzlX2zJMbdgC&pg=PA453&lpg=...
Interesting how the pressure sensor shows flattening but the thermistor shows amplitude reduction. Same event. Seems silly to define what the body does by how we choose to measure it. Kinda technical.
Duane McDade said:I know lets just set up a section at places like Cost-co and Walmart. Where some pimpled faced large adams appled teenager gives you a Sleep Apnea "kit" for you to take home. Then when you bring it back the next day he USB's it into his computer and it spits out a order for the CPAP machine and mask, that the testing equipment computed you need. A auto CPAP set at 4-20 cm/h20. If you need advice or if you have questions you'll be directed to a interactive web site. There's no need for sleep labs or Doctors. This whole thing reminds me of the hospital in the movie Idiocracy (2006) .
If this discussion is is referring to WatchPAT, what is "spit out" is a "Sleep Study Report", not an "order for the CPAP machine and mask". The sleep study itself, xPAP equipment and pressure settings must all still be ordered by a physician.
However, to your point, since the scoring algorithm is completely automated, I suppose "some pimpled faced large adams appled teenager" from "Cost-co and Walmart" could "gives you a Sleep Apnea 'kit' for you to take home" and "USB's it into his computer".
That being said, none of those scenarios offer rationale against the use of PAT in portable testing.
mollete
Cindy Brown said:
The biggest reason I'm responding is the statement that the WatchPAT 200 can detect UARS that can't be detected in the lab unless there is the application of special gauges. I don't see how one can detect the narrowing of the airway or the increased work of breathing with a snore mic, position sensor, pulse ox and "pat probe". I'm not even sure what the pat probe does.
PAT (peripheral vascular tonometry) measures digital vascular tone. WatchPAT searches for reduction in PAT amplitude, indicating increased digital vasoconstriction. This is an "autonomic arousal" (vs the "cortical arousal" of EEG). It cannot definitively diagnose UARS, it can only indicate high probability. Also, it cannot diferentiate between obstructive, central and/or mixed events (probability is determined by presence or absence of snoring). CompSAS will totally baffle it.
UARS can be effectively diagnosed using nasal presure transducers with respiratory inductance plethysmography.
mollete
I know lets just set up a section at places like Cost-co and Walmart. Where some pimpled faced large adams appled teenager gives you a Sleep Apnea "kit" for you to take home. Then when you bring it back the next day he USB's it into his computer and it spits out a order for the CPAP machine and mask, that the testing equipment computed you need. A auto CPAP set at 4-20 cm/h20. If you need advice or if you have questions you'll be directed to a interactive web site. There's no need for sleep labs or Doctors. This whole thing reminds me of the hospital in the movie Idiocracy (2006) .
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