Fig. 6. (A ) Relationship between K2values during spontaneous breathing and laryngeal resistance at a flow rate of 0.15 l/s (R larynx-0.15) (B ) Relationship between K2values during total paralysis and glottic aperture angle. Closed circles = data before surgery in the endotracheal tube (ETT) group; open circles = data after surgery in the ETT group; closed triangles = data before surgery in the Laryngeal Mask Airway ™ group; open triangles = data after surgery in the LMA ™ group.