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Left panel: Sec-by-sec averages (19 patients) of heart rate in individual patients in the interval dial-down onset (time 0) ± 10 sec. Right panel: Sec-by-sec averages (19 patients) of heart rate in individual patients in the 10-sec interval preceding upper airway opening. Data pertain to long dial-downs associated with severe obstruction. The heavy lines in the two panels are the overall averages.
