Postoperative changes in a bronchial stump following covering with free fat tissue in a rat model.

This article focuses on the effects of covering the bronchial stump with free fat tissue as a minimally invasive method to reinforce closure and potentially prevent bronchial stump fistulas after pulmonary resection. Using a rat model, the study found that free subcutaneous fat tissue sutured to the bronchial stump gradually transformed into fibrous connective tissue containing microvessels, significantly increasing the stump’s pressure resistance over time. The fat tissue secreted growth factors such as vascular endothelial growth factor (VEGF) and hepatocyte growth factor (HGF), which likely promoted angiogenesis and wound healing around the bronchial stump. While the findings support the reinforcing effect of free fat tissue coverage, the study notes limitations including the use of a normal rat model rather than one with impaired healing and the substitution of subcutaneous fat for pericardial fat, suggesting further research is needed to confirm clinical efficacy and optimize the technique.