Experimental microaneurysms in rats: II. Comparison between cotton wrapping and microbipolar coagulation

Area of Science:

• Vascular Surgery
• Experimental Medicine
• Biomedical Engineering

Background:

• Microsurgical aneurysm clipping is standard for intracranial aneurysms but unsuitable for microaneurysms.
• Alternative treatments like bipolar coagulation or wrapping lack proven efficacy.
• This study evaluates two methods to prevent experimental microaneurysm rupture.

Purpose of the Study:

• To assess the efficacy of microbipolar coagulation versus cotton wrapping in preventing the rupture of experimentally induced microaneurysms.
• To compare the protective effects of these treatments under induced hyperpressure.

Main Methods:

• Microaneurysms were created in the aortic bifurcation of 60 rats via mechanical compression.
• Rats were divided into three groups: microbipolar coagulation, cotton wrapping, or no treatment.
• Aneurysm resistance was tested using intraluminal hyperpressure (up to 2,427 mm Hg) four weeks post-treatment, followed by microscopic analysis.

Main Results:

• No ruptures occurred in the cotton-wrapped group (Group 2).
• All aneurysms ruptured in the microbipolar coagulation (Group 1) and no-treatment (Group 3) groups.
• The mean bursting pressure showed no significant difference between Groups 1 and 3 (p > 0.05).
• Rupture probability was significantly lower in Group 2 compared to Group 1 (p < 0.001).

Conclusions:

• Cotton wrapping of experimental microaneurysms significantly enhanced their resistance to rupture under hyperpressure.
• Microbipolar coagulation provided no significant protection against microaneurysm rupture.
• Wrapping demonstrates potential as an effective treatment for reinforcing microaneurysm walls.