Morphological changes in the saphenous vein after dilatation with silastic tubes. An experimental study

Area of Science:

• Vascular surgery
• Biomedical engineering
• Experimental pathology

Background:

• Vein grafts are crucial for bypass surgery.
• Challenges exist in vein graft suitability and patency.
• Improving vein graft characteristics is an ongoing research area.

Purpose of the Study:

• To develop and evaluate an experimental model for vein arterialization.
• To assess the morphological changes in veins subjected to arterial conditions.
• To determine the potential of arterialized veins for bypass grafting.

Main Methods:

• An experimental canine model was created using saphenous veins.
• Veins were cannulated with silastic tubes and left in situ for 1-9 weeks.
• Morphological and ultrastructural analyses (including electron microscopy) were performed.

Main Results:

• Observed "arterialization" characterized by fibromuscular hyperplasia and increased collagen deposition.
• Vasa vasorum remained preserved within the arterialized vein walls.
• Endothelium was replaced by irregular cells, possibly altered fibroblasts, with amorphous coating.

Conclusions:

• The experimental model demonstrated successful "arterialization" of veins.
• Arterialized veins exhibit structural modifications that might enhance suitability for bypass grafting.
• The thrombogenic potential of the luminal surface requires further investigation to assess graft viability.