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Won - Figure 36
TE-CSA: Polysomnographic Features (Continued)
FIG. 36: Severe hypoxemia and CO2 derangements may be widely tolerated during REM sleep, but because loop gain is high during non-REM sleep compared with REM sleep in TE-CSA, central apneas occur almost exclusively during non-REM sleep and resolve during REM sleep. The central graph in this Figure is a reading of the pulse oximeter showing cyclical desaturations during the first half of the night that are due to obstructive apneas. The patient is started on CPAP and BiPAP and result is continuous cyclical desaturations, this time due to central apneas. What is notable is the normal saturation during REM sleep, as indicated by the arrows (and shown in the top graph by the black bars).
Won C. Chest 2016;00.
