[Need for randomizing microvascular surgical experiments for testing new prosthesis material, with special reference...

Area of Science:

• Vascular Surgery
• Biomaterials Science
• Microsurgery

Background:

• Assessing the efficacy of microvascular prostheses requires rigorous methodology to control for surgical skill and potential errors.
• Polyurethane prostheses, available in various designs, are utilized in vascular reconstructions.

Purpose of the Study:

• To compare the long-term patency of porous versus smooth silicon-lined polyurethane prostheses implanted in the rat infrarenal aorta.
• To evaluate the impact of microsurgical technique and randomization on the interpretation of prosthesis performance.

Main Methods:

• Two types of polyurethane prostheses (porous and silicon-lined) were implanted in 30 rats (n=15 each) using microsurgical techniques in the infrarenal abdominal aorta.
• Prospective randomization was employed to distribute outcomes, including technical errors, across experimental groups.
• Patency was assessed over a maximum observation period of 407 days, with histological examination for complications.

Main Results:

• The porous polyurethane prosthesis exhibited significantly better long-term patency compared to the silicon-lined prosthesis.
• Early thrombosis and technical surgical errors were the most frequent complications identified.
• Histological analysis confirmed the incidence of technical faults influencing patency outcomes.

Conclusions:

• Porous polyurethane prostheses are a promising option for infrarenal aortic reconstruction, demonstrating superior patency.
• Prospective randomization is crucial for self-critical assessment of microsurgical dexterity and for mitigating the impact of technical errors on material analysis.
• Careful surgical technique is paramount to minimize early complications like thrombosis and ensure reliable prosthesis performance.