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Representative trace of pressure‐flow relationships in one subject for each sedated condition: dexmedetomidine, propofol, and ketamine. The extrapolated estimated zero closing pressure was obtained by a linear regression curve between PN and V I max. The equation of the linear regression is Y = 117x + 1.2, R 2 = 0.95 for propofol, Y = 82x + 15, R 2 = 0.99 for dexmedetomidine, and Y = 29x + 186, R 2 = 0.97 for ketamine
