Figure 71-4 A combination of backward head tilt and anterior mandibular displacement is most effective in relieving airway obstruction from pharyngeal blockade by the tongue. This maneuver will also be helpful in relieving obstruction caused by laryngeal spasm. (From Ruben HM, Elam JO, Ruben AM, et al: Investigation of upper airway problems in resuscitation. Anesthesiology 22:271, 1961.)