Predicting decannulation outcomes after distraction osteogenesis for syndromic micrognathia

Objectives. To characterize the airway anatomy by upper endoscopy in children with syndromal mandibular hypoplasia and to determine whether predistraction endoscopy is predictive of the likelihood of successful outcomes after mandibular distraction. Study Design: Retrospective chart review. Methods: Assessment of the upper airway by subsites was qualitatively extrapolated into a devised 4-point scale. Upper airways were characterized and evaluated in patients on the basis of decannulation outcomes after distraction. Results. Of the 20 patients, 12 were decannulated, and 6 remain tracheostomy dependent. The average compiled preoperative airway obstruction scores in decannulated. patients (2.25) compared with those who failed decannulation (2.36) was not statistically significant (P = .291). A significant change after distraction was noted only at the levels of the oropharynx and supraglottis (P < .001). The average airway scores at these subsites in decannulated patients improved from a mean of 3.46 to 2.17 (P = .002). In patients who failed decannulation, the pre- and postdistraction scores also improved from 3.92 to 2.50 (P = .026). Analysis of the average postdistraction airway scores in decannulated patients (2.17) compared with failures (2.5) failed to reveal a significant difference (P = .375), suggesting that some patients remain tracheostomy dependent despite adequate mandibular expansion. Preoperative airway scores in the two groups were statistically equivocal and, therefore, not predictive of the likelihood of decannulation. Conclusions: Preoperative airway endoscopy alone is not predictive of the likelihood of successful decannulation after distraction osteogenesis. Comparison of the airway patency after distraction revealed statistically equivocal airway caliber, suggesting that some children fail to advance to decannulation despite adequate mandibular distraction.