Fig. 2From: Effects of head-elevated position on tracheal intubation using a McGrath MAC videolaryngoscope in patients with a simulated difficult airway: a prospective randomized crossover studyA Head-flat position without pillow. B Head-elevated position with horizontal alignment of the external auditory meatus (EAM) and sternal notch (SN). The position of the air bubble in the spirit level acts as a guide to adjust the table ramp angleBack to article page