A model of proximal middle cerebral artery occlusion in rat

Area of Science:

• Neuroscience
• Surgical techniques
• Ischemic stroke research

Background:

• Developing a reproducible animal model for studying ischemic stroke is crucial for advancing research.
• Existing models often involve invasive procedures like craniotomy and intubation, which can affect experimental outcomes.
• Preserving collateral circulation is essential for accurate metabolic and pharmacologic studies of ischemic brain regions.

Purpose of the Study:

• To describe a highly reproducible surgical model for middle cerebral artery (MCA) occlusion in rats.
• To detail a minimally invasive surgical approach that avoids craniotomy and brain retraction.
• To establish a model that maintains spontaneous ventilation and preserves cortical collateral circulation.

Main Methods:

• Occlusion of the middle cerebral artery (MCA) at its proximal portion.
• Surgical access via a widened foramen ovale, eliminating the need for craniotomy.
• Maintenance of spontaneous ventilation without intubation.
• Preservation of collateral blood flow to the cerebral cortex.

Main Results:

• The described surgical technique results in highly reproducible MCA occlusion.
• The approach minimizes surgical invasiveness, reducing potential confounding factors.
• Spontaneous ventilation and preserved collateral circulation were consistently achieved.
• The model is suitable for metabolic and pharmacologic investigations of ischemic tissues.

Conclusions:

• This model offers a significant advancement in the reproducibility of MCA occlusion studies.
• The minimally invasive nature and preserved physiological conditions make it ideal for detailed stroke research.
• The technique facilitates reliable investigation into the pathophysiology and treatment of ischemic stroke.