Tracheobronchial stenting for the treatment of airway obstruction.

PURPOSE: The authors report a 5-year experience of inserting the Palmaz stent into infants and children who had a variety of major airway obstructions.
METHODS: From 1992 to 1997, 30 balloon expandable stents (Palmaz) were inserted in the trachea (n = 18) and bronchi (n = 12) of 16 infants, ages 1 week to 26 months (median, 9 months), suffering from three types of serious airway obstruction. In group 1, 10 stents were placed in eight children for tracheal or bronchomalacia. In group II, 11 stents were inserted in four infants for stricture at the site of surgical repair of stenosis. In group III, nine stents were placed to relieve airway compression from enlarged pulmonary arteries associated with severe congenital heart disease in three children and mediastinal lymphangioma in one. Tracheal stents were 30 mm long and were expanded to 8 to 10 mm at placement. Bronchial stents were 12 to 15 mm long and were expanded to 7 to 9 mm. The nonexpanded stents were placed on an inflatable balloon catheter and were inserted into the desired position in the airway through a bronchoscope or endotracheal tube using x-ray control. They were expanded and fixed in place by inflating the balloon to its rated diameter.
RESULTS: In group I, granulation tissue developed over the stents in five of eight cases. Obstructing granulations were removed by scraping or balloon compression in three and resulted in earlier than the planned removal in two. Stents have now been removed in six of eight cases. Major airway obstruction has not recurred. In group II, stents have been in place in all cases for 13 to 56 months after insertion, but in one child with three stents, two were removed for obstructive granulations 44 months after insertion. All are well. All group III patients could be extubated after stenting, but two with heart disease died after 3 and 12 months of palliation. During the course of follow-up, stents in the bronchi of two had migrated, and an additional stent was required. Autopsy in one showed full-thickness bronchial erosion but no perforation by the stent. A total 11 of 30 stents have been removed bronchoscopically in seven children without complications. Another child referred here for tracheal stent removal after laser resection of granulations died at attempted removal because the stent was "welded" into the tracheal wall by the inflammatory reaction. Manipulation of the stent completely occluded the airway.
CONCLUSIONS: Airway stents can be inserted easily and safely and left in-situ for prolonged periods to relieve major airway obstruction from a variety of causes. Tissue reaction may necessitate bronchoscopic manipulation and early stent removal, and adds to the difficulty of removal.