Effects of CPAP Treatment on Electroencephalographic Activity in Patients with Obstructive Sleep Apnea Syndrome During Deep Sleep with Consideration of Cyclic Alternating Pattern.

With CPAP treatment, a general trend of decrease in the absolute power of delta waves in phase B (B1, B2, and B3) was found while those of other EEG waves were either significantly decreased or unchanged ( Figure 2 ). In phase A1, the relative power of delta waves was significantly increased, while that of other EEG waves showed a trend of decrease with CPAP treatment.

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