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Updated: Aug 6, 2026
Use of a Rat Model to Study Ventral Abdominal Hernia Repair
Published on: October 2, 2017
Impact of PA-MSHA on Postoperative Seroma Formation and Tissue Remodeling in Rat Abdominal Wall Hernia Model
Wenke Guo1, Bin Fei2, Haigang Niu3
1Department of Thyroid Surgery, Fenyang Hospital of Shanxi Province, Lvliang, Shanxi, China.
Background:
Seroma is one of the most common postoperative complications following hernia repair. This study evaluated whether the local application of Pseudomonas aeruginosa injection (PA-MSHA) could reduce the duration of seroma and promote healing of the graft and surrounding tissues after abdominal wall incisional hernia repair.
Methods:
56 Sprague-Dawley rats were used to assess the efficacy and optimal dosage of PA-MSHA in reducing seroma formation after latissimus dorsi resection. 54 rats underwent abdominal wall hernia repair and were randomly assigned to three groups: sham, saline, or PA-MSHA. Seroma formation was monitored, and tissue samples were collected for histological and immunohistochemical analyses.
Results:
Among five groups, the medium-dose group (0.1 mL/kg) demonstrated the most significant reduction in seroma volume. PA-MSHA significantly shortened the duration of seroma and enhanced both early and mid-term tissue healing. Sirius Red staining indicated a significantly higher collagen type I/III ratio on days 7 and 14. Immunohistochemical analysis demonstrated elevated expression of CD68 and CD31 during the early healing phase in the PA-MSHA group. By day 28, graft shrinkage did not differ significantly among the groups.
Conclusions:
Intraoperative local administration of PA-MSHA effectively reduced seroma persistence and enhanced early tissue regeneration and abdominal wall integrity without triggering excessive foreign body reactions or adverse events.
Insights
Local application of Pseudomonas aeruginosa injection (PA-MSHA) effectively reduced seroma duration and improved tissue healing after hernia repair. This treatment enhanced abdominal wall regeneration without adverse effects.
Area of Science:
- Surgical innovation
- Wound healing research
- Biomedical engineering
Background:
- Seroma formation is a frequent complication after hernia repair surgery.
- Investigating novel therapeutic strategies to mitigate postoperative complications is crucial.
- Abdominal wall incisional hernia repair presents unique challenges in tissue healing.
Purpose of the Study:
- To evaluate the efficacy of Pseudomonas aeruginosa injection (PA-MSHA) in reducing seroma duration.
- To assess the impact of PA-MSHA on graft and surrounding tissue healing post-hernia repair.
- To determine the optimal dosage of PA-MSHA for seroma management.
Main Methods:
- Animal study involving Sprague-Dawley rats (n=56) for initial assessment and (n=54) for hernia repair.
- Randomized controlled trial comparing sham, saline, and PA-MSHA treatment groups.
- Histological and immunohistochemical analyses to evaluate tissue regeneration and inflammatory responses.
Main Results:
- Medium-dose PA-MSHA (0.1 mL/kg) significantly reduced seroma volume and duration.
- Enhanced early and mid-term tissue healing, indicated by increased collagen type I/III ratio.
- Increased expression of CD68 and CD31 suggests modulated inflammatory and angiogenic responses.
Conclusions:
- Intraoperative local PA-MSHA administration is effective in reducing seroma persistence.
- PA-MSHA promotes early tissue regeneration and enhances abdominal wall integrity.
- No significant foreign body reactions or adverse events were observed with PA-MSHA treatment.
