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The vertical dotted line is the time point of transition. The continuous recording of the MCAV increases with reduction in airflow and BP during the alpha–theta transition. Power, Doppler power signal; Doppler, continuous recording of the MCAV; SaO2, arterial oxygen saturation; PET,CO2, partial pressure of carbon dioxide; BP, arterial blood pressure; EEG, electroencephalogram (lead O1A2).
