Implanted device for middle cerebral artery occlusion in conscious cats

Area of Science:

• Neurology
• Vascular Surgery
• Animal Models

Background:

• Middle cerebral artery occlusion is a common cause of ischemic stroke.
• Developing reliable animal models is crucial for stroke research.
• Understanding acute ischemic changes is vital for developing effective treatments.

Purpose of the Study:

• To develop and validate a simple implantable device for inducing acute middle cerebral artery occlusion in conscious adult cats.
• To characterize the neurological deficits and cerebral changes following induced occlusion.
• To assess the effects of reperfusion after device removal.

Main Methods:

• An implantable device was placed on the left middle cerebral artery of adult cats.
• The artery was acutely occluded using the device in conscious animals.
• Neurological deficits, cerebral angiography, and light microscopy of brain tissue were assessed.
• The artery was reopened by removing the occluding stylet.

Main Results:

• Occlusion rapidly induced circling and head deviation, followed by right hemiparesis.
• Cerebral angiography confirmed successful middle cerebral artery occlusion and subsequent reopening.
• Light microscopy revealed severe acute ischemic changes in the left cerebral cortex and subcortical areas.
• The occluded artery segment showed endothelial lining loss and medial thinning.

Conclusions:

• The implantable device provides a reliable method for inducing focal cerebral ischemia in cats.
• This model allows for the study of acute stroke pathophysiology and the effects of reperfusion.
• The observed histological changes highlight the rapid and severe consequences of middle cerebral artery occlusion.