A Design-Based Stereologic Method to Quantify the Tissue Changes Associated with a Novel Drug-Eluting...

Area of Science:

• Pulmonary Medicine
• Biomedical Engineering
• Surgical Innovation

Background:

• Granulation tissue is a frequent complication following airway stenting.
• Current methods lack the ability to quantify the volume and type of tissue that develops post-stenting.

Purpose of the Study:

• To employ design-based stereology for quantifying tissue volume and type changes after airway stenting.
• To compare drug-eluting stents (DES) with standard silicone stents in pigs.

Main Methods:

• A randomized trial in pigs comparing DES with silicone stents.
• Placement of tracheal stents via rigid bronchoscopy, followed by necropsy after 1 month.
• Utilized design-based stereology and point-counting methods to quantify tissue volume density, normalized to cartilage volume.

Main Results:

• Stented airways showed a 110% increase in soft-tissue volume compared to nonstented controls (p = 0.005).
• Significant increases observed in submucosal connective tissue (118%), epithelium (70%), submucosal glands (47%), and smooth muscle (41%).
• No significant differences in tissue microbiology, tracheal thickness, or granulation tissue volume between DES and control stents.

Conclusions:

• Airway stenting effectively doubles the soft tissue volume within the trachea.
• Design-based stereology is a viable method for quantifying tissue alterations resulting from airway stenting.