Pericardium matrix buttressing hinders the stapled bronchial stump healing

Area of Science:

• Biomedical Engineering
• Thoracic Surgery
• Materials Science

Background:

• Evaluating the efficacy of biomaterials in surgical procedures is crucial.
• Bovine pericardial matrix plus collagen is a potential reinforcement for stapled bronchial closures.

Purpose of the Study:

• To compare the biomechanical and histological properties of stapled bronchial stumps with and without bovine pericardial matrix plus collagen reinforcement.

Main Methods:

• Pneumonectomy and mechanical bronchial suturing were performed in a swine model.
• Three groups were studied: traditional stapling, buttressed stapling (with reinforcement), and normal bronchus.
• Biomechanical testing (tensile strength, elongation, stiffness) and histological analysis were conducted after 60 days.

Main Results:

• Unreinforced (Traditional) stapled stumps showed higher maximal strain resistance and elongation at rupture compared to reinforced (Buttressed) stumps.
• Normal bronchial tissue exhibited the highest stiffness coefficient (K).
• Histological analysis revealed greater thickness and inflammatory reactions in Buttressed stumps, indicating incomplete healing.

Conclusions:

• Reinforcement of mechanical suture lines with bovine pericardial matrix plus collagen results in suboptimal biomechanical and histological outcomes.
• The use of staplers alone appears to yield superior results for bronchial stump closure in this model.