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resmed forced oscillation method - rberry1 - 06-28-2024

Hello all
I can see ResMed 4Hz in pressure signal when apnea suspected.   CAs do indeed show 4 hz signal in flow (open airway).  This I expected.  What was not expected is events classified as OA (closed airway) when the flow signal also shows 4 Hz signal.  I expected absence.  So I thought might be amplitude difference but does not appear to be so.   I can only concluded that something beside transmission of 4 Hz pressure pressure vibrations to flow is used to define OAs.  What am I missing here?

thanks RB