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Typical episodes of obstructive apnea accompanied with desaturation, arousals and sympathetic surges. This recording segment is from non-REM sleep in a patient with severe OSA. Black arrow shows arousals characterized by abrupt changes in both EEG and EMG, accompanied with SKNA burst activities (black triangle). EEG, electroencephalogram; EMG, electromyogram; SpO2, pulse oxygen saturation.
