Intraperitoneal Polypropylene Mesh in Clean, Potentially Septic, and Controlled Contamination Fields: An Experimental...

Area of Science:

• Surgical innovation
• Biomaterials science
• Inflammatory response

Background:

• Intraperitoneal onlay mesh (IPOM) is effective for ventral/incisional hernia repair but poses risks of adhesions and infection.
• The impact of contamination severity on the peritoneal response to IPOM requires further investigation.
• Understanding mesh behavior in contaminated environments is crucial for surgical safety.

Purpose of the Study:

• To evaluate how varying degrees of contamination affect the peritoneal tissue's response to intraperitoneal polypropylene mesh.
• To compare adhesion formation and histological changes in response to mesh placement under clean, potentially septic, and controlled contamination conditions.
• To provide evidence-based guidance on the selective use of IPOM in contaminated surgical fields.

Main Methods:

• Prospective, randomized, blinded rat study involving 60 Wistar rats.
• Three groups: clean mesh placement, mesh with potential contamination from bowel resection, and mesh with controlled bacterial inoculation (E. coli, S. aureus).
• Assessment at postoperative days 4 and 8, evaluating adhesion severity and histological parameters (neutrophil infiltration, fibroblast proliferation, neoangiogenesis, collagen deposition).

Main Results:

• No significant difference in adhesion severity between clean and potentially septic (bowel resection) groups.
• Controlled contamination group exhibited significantly higher adhesion scores (grades 2-3) compared to clean and potentially septic groups (p < 0.001).
• Histological analysis revealed significantly increased neutrophil infiltration, fibroblast proliferation, neoangiogenesis, and collagen deposition in the controlled contamination group (p < 0.001).

Conclusions:

• Intraperitoneal polypropylene mesh elicits comparable early biological responses in clean and potentially septic conditions.
• Established intra-abdominal sepsis significantly escalates inflammation, fibroproliferation, and adhesion formation around the mesh.
• Selective use of synthetic intraperitoneal mesh may be feasible in controlled contamination scenarios, but caution is advised in frankly septic environments.