简介：
Overview
This article presents a protocol for evaluating aneurysm perfusion and vessel patency using fluorescein-based fluorescence video angiography (FVA) in animal models (rats and rabbits). The method is noted for its high positive predictive value of 92.6%, and its simplicity and cost-effectiveness are emphasized, requiring no special equipment.
Key Study Components
Area of Science
- Neuroscience
- Vascular biology
- Fluorescence imaging
Background
- Aneurysms pose significant clinical challenges in terms of perfusion assessment.
- Existing methods may require expensive equipment and extensive surgical procedures.
- Fluorescein video angiography provides a solution for real-time visualization.
- The technique's versatility across different animal models is noteworthy.
Purpose of Study
- To develop a reliable method for visualizing blood flow in aneurysms.
- To evaluate vessel patency without the necessity of costly equipment.
- To provide a straightforward protocol that can be widely implemented in research.
Methods Used
- Fluorescence video angiography (FVA) was the main platform utilized.
- Animals used included rats and rabbits, specifically assessing blood flow during and post-surgery.
- No multiomics workflows were mentioned.
- The procedure involved anesthetizing animals, preparing the surgical site, injecting fluorescein sodium, and employing a modified camera setup.
- Key steps included ensuring minimal light during visualization and precise timing in image capture post-injection.
Main Results
- The method successfully visualized blood flow in 8 out of 10 rabbits and identified significant residual perfusion cases.
- Of 16 aneurysms assessed, 11 were detectable by FVA that had not been observed macroscopically.
- In rats, residual perfusion was confirmed in 22 of 23 aneurysms without visible macroscopic signs.
- Overall, a combination of 25 of 27 total cases showed confirmation of perfusion using FVA.
Conclusions
- This procedure demonstrates a strong capability for assessing aneurysm blood flow effectively.
- The application of FVA facilitates real-time surgical visualization and assessment of perfusion status.
- The implications extend to improved understanding and evaluation techniques for vascular conditions in research settings.
What are the advantages of using fluorescein video angiography?
FVA offers a cost-effective and simple approach to visualize blood flow in aneurysms without needing expensive devices.
How is the animal model prepared for FVA?
Animals must be anesthetized and positioned appropriately, with the surgical area disinfected and prepared for the fluorescein injection.
What types of outcomes are obtained from this method?
The main outcomes include real-time visualization of blood flow, identification of residual perfusion, and assessment of vessel patency.
Can this method be adapted for different species?
Yes, FVA can be utilized in various animal models, as demonstrated with both rats and rabbits in this study.
What are the limitations of the FVA technique?
Key limitations include the requirement for a dark environment for optimal visualization and the need for careful execution of the dissection of vessels.
How does FVA contribute to our understanding of aneurysms?
FVA enhances the ability to visualize blood flow dynamics in aneurysms, aiding in surgical decision-making and improving insights into vascular biology.
What are the critical steps in performing FVA?
Essential steps include the preparation of the camera and filters, proper animal positioning, and precise timing during fluorescein administration and illumination.
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