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A Porcine Heterotopic Heart Transplantation Protocol for Delivery of Therapeutics to a Cardiac Allograft
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Tracheal replacement with cryopreserved allogenic aorta.

Demosthènes Makris1, Muriel Holder-Espinasse, Alain Wurtz

  • 1Critical Care Department, University Hospital Larisa, University of Thessaly, Larisa, Greece.

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Cryopreserved aortic allografts (CAAs) show potential for replacing long tracheal segments in tracheal tumor patients. While grafts transform into hybrid conduits, prolonged stenting is likely necessary for successful clinical application.

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Area of Science:

  • Biomaterials science
  • Regenerative medicine
  • Surgical innovation

Background:

  • Radical resection of extensive primary tracheal tumors is surgically challenging.
  • Cryopreserved aortic allografts (CAAs) offer a potential solution for replacing long tracheal segments.

Purpose of the Study:

  • To evaluate the efficacy of CAAs as tracheal substitutes in a preclinical model.
  • To assess the long-term integration and remodeling of CAAs in tracheal defects.

Main Methods:

  • Tracheal replacement with CAAs in 16 adult minipigs.
  • Silicone stent splinting for 12 months.
  • Follow-up via bronchoscopy and histological analysis up to 18 months.

Main Results:

  • CAAs underwent transformation into chimerical conduits with mixed aortic and tracheal histologic features.
  • Significant tracheal stenosis occurred in 60% of animals after stent removal at 12 months.
  • Host-derived cells contributed to neochondrogenesis within the graft.

Conclusions:

  • CAAs represent a promising tracheal substitute for extensive tumor resections.
  • Prolonged stenting is crucial for the clinical viability of CAA tracheal reconstruction.