“…In several instances, patients who failed initial intervention, ultimately requiring tracheostomy, were found to have concomitant airway anomalies, such as laryngomalacia, tracheal webs and vascular rings 36,48,52,79–83 . Patients with central apnea or neurologic disabilities also were likely to fail either MDO or TLA 36,56,66,79,84,85 . Most studies excluded patients with these comorbidities from their analysis, although one study on subjects with layrngomalacia treated with MDO reported 100% success in avoidance of tracheostomy or decannulation 86 .…”