Sleep Staging

Portable monitors do not generally provide a measure of REM sleep and many do not provide body position. This makes it difficult to fully characterize the RDI result. For example, a patient who snores and has severe daytime sleepiness may sleep mostly in stages 2 to 4 of NREM sleep and have a RDI of four on one night but have normal REM on a second night with a RDI of 15. Most portable monitors do not have sleep staging and the interpretation of these two RDIs would be difficult. On the other hand, a PSG with sleep stages would provide important information in the interpretation of the study. In particular, an AHI of four in the first case would potentially prompt a second baseline study but in the case of the portable monitor it might be interpreted as nonsignificant and the patient may not be properly evaluated.

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