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Cuff pressure by head and neck position with HVLP and taper cuffs. HVLP group: trachea was secured using a tracheal tube with a high-volume low-pressure cuff; Taper group: trachea was secured using a tracheal tube with a taper-shaped cuff. ∗ P < 0.05 compared to taper. # P < 0.05 compared to neutral position. (a) Initial cuff pressure of 15 cmH2O, (b) initial cuff pressure of 20 cmH2O, and (c) initial cuff pressure of 25 cmH2O.
