Results
Among the four cases, ages ranging from 8 to 17(Table 1), airway stent implantation was a commonality. Notably, the patients exhibited significant improvements in R5-R20 post-stent intervention (-0.37 ± 0.21kPaA/L/s, P=0.04), experiencing relief in respiratory symptoms and enhanced airway diameters, affirmed by bronchoscopy and chest X-ray findings. All subjects met criteria for severe obstructive lung disease, supported by their positive bronchodilator response in impulse oscillometry. An immediate spike in airway dimensions, validated through images, underscored the positive impact of stent implantation. Following the procedure, patients were treated with inhaled long-acting beta-2 agonists and inhaled corticosteroids (ICS-LABA). Our study demonstrated that airway stent implantation improved small airway functions of patients with congenital airway anomalies. In the meantime, we also showed feasibilty of using impulse oscillometry for assess respiratory function after stent implantation.