Also endotracheal tube and blade size, oral airway need for maintaining ventilation, burp maneuver requirement, and number of attempts were recorded.
There were no statistically significant differences between groups regarding endotracheal tube and blade size, stylet or oral airway need for intubation, or BURP maneuver requirement (p>0.05).
When advancing the nasotracheal tube in 5 of the 19 patients (26.31 %) it collided against the arytenoid cartilages and a Burp maneuver (mild external compression of the thyroid cartilage towards the back) was required in order to lower the glottis slightly and allow for the passage of the nasotracheal tube.
In 2 of the 19 patients (10.5 2 %) the nasotracheal tube was directed straight into the esophagus and it was impossible to introduce it through the glottis, despite a Burp maneuver. Thus, it was necessary to pass the Bonfils retromolar fiberscope under the tube (Figure 6) and simultaneously advance the tube and the Bonfils, localize the glottis, take the tube down to the glottis and advance it, watching the passage of the tube through the vocal cords (Figure 7).