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Endothelial inflammatory and thrombogenic expression changes in microvascular anastomoses - An immunohistochemical
Raimund H M Preidl1, Silvy Reuss1, Friedrich W Neukam1
1Department of Oral and Maxillofacial Surgery, University of Erlangen, Nuremberg, Germany.
Summary
Microvascular anastomoses show endothelial dysfunction regardless of patency. Minimizing surgical trauma is crucial to prevent worsening this condition and its pro-inflammatory, pro-thrombotic state.
Area of Science:
- Vascular Surgery
- Endothelial Biology
- Immunohistochemistry
Background:
- Microvascular anastomoses are critical in reconstructive surgery.
- Endothelial dysfunction contributes to anastomosis failure.
- Understanding mediator expression is key to improving outcomes.
Purpose of the Study:
- To investigate intraluminal vessel diameters and endothelial mediator expression in patent vs. non-patent microvascular anastomoses.
- To compare these findings with non-anastomosed control arteries.
Main Methods:
- Immunohistochemistry was used to evaluate endothelial expression of CD31, VCAM-1, E- and P-Selectin, eNOS, iNOS, and PAI-1.
- Hematoxylin and eosin (H.E.) staining determined intraluminal diameters.
- Analysis included 20 human anastomoses (8 patent, 12 non-patent).
Main Results:
- No significant differences in de-endothelialization or luminal narrowing between patent and non-patent anastomoses.
- Pro-inflammatory mediators were higher in anastomoses than controls, but not different between patent/non-patent groups.
- Non-patent anastomoses showed higher iNOS and PAI-1 expression compared to patent anastomoses and controls.
Conclusions:
- Microvascular anastomoses exhibit endothelial dysfunction, characterized by a pro-inflammatory and pro-thrombotic milieu, irrespective of patency.
- Minimizing endothelial trauma during microanastomosis suturing is essential to avoid exacerbating existing dysfunction.
- Further research is needed on medication-related effects on anastomoses.
