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Correlation between the reduction of vascular AAI during REM sleep by NHF compared with the room air condition (y-axis) and impaired lung function assessed as FEV1 (x-axis).
Note: Note that a reduction of REM-AAI during NHF treatment translates to a positive value on the y-axis and vice versa.
Abbreviations: AAI, autonomic activation index; NHF, nasal high flow; REM, rapid eye movement.
