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COPD desaturation characteristics
| Occurs mainly during REM sleep |
| Presents considerable variability in nocturnal desaturation from night to night |
| Statistically relationships exist between nocturnal desaturation and daytime hypoxemia and hypercarbia |
| Nocturnal desaturarion cannot be predicted from awake measurement of arterial oxygen saturation in individual patients |
Abbreviations: COPD, chronic obstructive pulmonary disease; REM, rapid eye movement sleep.
