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Tracheal Self-Expandable Metallic Stents: A Comparative Study of Three Different Stents in a Rabbit Model.

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Nitinol stents showed the least tracheal reactivity, while steel stents caused significant stenosis. Drug-eluting stents led to destructive lesions, making them unsuitable for tracheobronchial stenosis treatment.

Keywords:
Airway obstructionAnimal modelsDrug-eluting stentsEstenosis traquealExperimentación animalObstrucción de la vía aéreaStentsStents liberadores de fármacosTracheal stenosis

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Area of Science:

  • Biomaterials Science
  • Medical Devices
  • Respiratory Medicine

Background:

  • Tracheobronchial stenosis management often involves self-expandable metal stents (SEMS).
  • Assessing the biocompatibility and reactivity of different SEMS materials is crucial for patient outcomes.

Purpose of the Study:

  • To evaluate and compare the tracheal reactivity of steel (ST), nitinol (NiTi), and nitinol drug-eluting stents (DES) in a rabbit model.
  • To determine the efficacy of computed tomography (CT) and anatomical pathology (AP) in assessing stent-induced tracheal changes.

Main Methods:

  • Forty rabbits were divided into four groups: ST, NiTi, DES, and control.
  • SEMS were deployed percutaneously; animals were assessed using multi-slice CT scans and AP.
  • Statistical analysis correlated CT and AP data to quantify stenosis, granuloma, and tissue reactivity.

Main Results:

  • The nitinol drug-eluting stent (DES) group exhibited the longest stenosis and highest granuloma formation.
  • The nitinol (NiTi) group demonstrated the lowest grade of stenosis and least reactivity.
  • Steel (ST) stents induced intense proliferative reactivity, while DES caused destructive lesions in 70% of animals.

Conclusions:

  • Nitinol (NiTi) stents are the least reactive and suitable for tracheobronchial applications.
  • Steel (ST) stents are associated with significant stenosis and granulomas.
  • Drug-eluting stents (DES) in this study caused significant adverse reactions, suggesting they are not recommended for tracheobronchial stenosis.