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Representative polysomnographic recordings from one patient with OSA (A), and one with CSA (B), during stage 2 sleep. Arrows indicate the onset of arousals. Note outofphase thoracoabdominal motion during obstructive apnea that becomes inphase immediately following the arousal indicating termination of the obstructive event (A). In contrast, the arousal occurred several seconds after the end of the central event (B).
