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Figure 3 | Critical Care

Figure 3

From: Balloon laryngoscopy reduces head extension and blade leverage in patients with potential cervical spine injury

Figure 3

Lateral neck radiograph during conventional direct laryngoscopy(informed and written patient consent were obtained). The angle of headextension is defined as 90°–â2.â1, anglebetween AH and horizontal plane; â2, angle betweenocclusal surface of maxillary molarsand horizontal plane;â3, angle of laryngoscope blade levering motion; AH, axis ofhandle; CH, chord corresponding to the radian formed by the proximal third ofthe laryngoscope blade convex surface; E, distal end point of said radian; OS,axis of occlusal surface of maxillary molars or gums.

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