Posterior circulation infarct

Posterior Circulation Infarct (PCI) refers to a type of ischemic stroke that occurs in the posterior circulation of the brain, which supplies blood to the brainstem, cerebellum, and occipital lobes. This condition is significant due to the critical functions of these brain regions, including coordination, balance, vision, and consciousness. Understanding the causes, symptoms, diagnosis, and treatment of PCI is crucial for managing its impacts effectively.

Causes

Posterior Circulation Infarct is primarily caused by the blockage or narrowing of the arteries that supply blood to the posterior part of the brain. The main arteries involved include the vertebral arteries, basilar artery, and posterior cerebral arteries. The blockage may result from various conditions, including:

• Atherosclerosis, where the arteries become clogged with fatty deposits.
• Embolism, where blood clots from other parts of the body travel to the brain.
• Arterial dissection, which is a tear in the artery wall.
• Hypercoagulability, an increased tendency for blood clotting.

Symptoms

The symptoms of a Posterior Circulation Infarct can vary widely depending on the specific brain areas affected but may include:

• Vertigo and dizziness
• Ataxia, or lack of muscle coordination
• Visual disturbances, including blindness in one half of the visual field (hemianopia)
• Weakness or numbness on one side of the body
• Dysphagia, or difficulty swallowing
• Dysarthria, difficulty speaking
• Headache
• Confusion and changes in consciousness

Diagnosis

Diagnosing PCI involves a combination of clinical assessment and imaging studies. Key diagnostic tools include:

• Magnetic Resonance Imaging (MRI), which can provide detailed images of the brain's structure and identify areas of infarction.
• Computed Tomography (CT) scans, which can quickly identify hemorrhages but may not initially show ischemic strokes.
• Magnetic Resonance Angiography (MRA) or CT Angiography (CTA), which are used to visualize the blood vessels and detect blockages or other abnormalities.

Treatment

Treatment for Posterior Circulation Infarct aims to restore blood flow to the affected area of the brain and prevent further strokes. Treatment options include:

• Thrombolysis, the administration of clot-busting drugs, which is most effective if administered within a few hours of stroke onset.
• Anticoagulant therapy, to prevent new clots from forming.
• Antiplatelet therapy, to prevent clotting.
• In some cases, surgical interventions such as angioplasty and stenting may be necessary to open blocked arteries.
• Rehabilitation therapies, including physical therapy, occupational therapy, and speech therapy, are crucial for recovering lost functions.

Prevention

Preventing a Posterior Circulation Infarct involves managing the risk factors for stroke. This includes:

• Controlling hypertension (high blood pressure)
• Managing diabetes
• Reducing cholesterol levels
• Quitting smoking
• Maintaining a healthy weight
• Regular physical activity

See Also

• Ischemic stroke
• Cerebrovascular accident
• Stroke prevention