Basilar artery occlusion is one of the most severe types of ischemic stroke. It occurs when the basilar artery, one of the main blood vessels of the vertebrobasilar system, becomes partially or completely blocked, preventing blood flow to vital structures of the brain.
Although it accounts for a small percentage of all strokes, basilar artery occlusion is a true medical emergency due to the high risk of severe disability and death if not treated immediately.
What is the basilar artery?
The basilar artery is formed by the joining of the two vertebral arteries at the base of the skull. From there, it ascends along the surface of the brainstem and gives rise to numerous branches that supply blood to different structures of the brain.
Finally, the basilar artery divides into the two posterior cerebral arteries, forming part of the brain’s posterior circulation.
What structures does it supply?
The basilar artery supplies blood to regions that are essential for the body’s functioning, including:
- Brainstem.
- Pons.
- Midbrain.
- Cerebellum.
- Thalamus (through some of its branches).
- Occipital lobes via the posterior cerebral arteries.
These structures control vital functions such as breathing, consciousness, balance, coordination, vision, and numerous automatic movements.
What is basilar artery occlusion?
Basilar artery occlusion occurs when a blood clot completely or significantly blocks blood flow through this vessel.
As a result, the structures supplied by the artery no longer receive oxygen and nutrients, triggering a process of brain damage that can progress rapidly if blood flow is not restored.
Main causes
The most common causes include:
- Thrombosis associated with atherosclerotic plaques.
- Emboli originating from the heart.
- Atrial fibrillation.
- Vertebral artery dissection.
- Blood clotting disorders.
- High blood pressure.
- Diabetes mellitus.
- High cholesterol.
- Smoking.
In some patients, it is not possible to identify a specific cause after medical evaluation.
Symptoms of basilar artery occlusion
Clinical manifestations can vary depending on the degree of obstruction and the structures affected.
The most common symptoms include:
- Severe dizziness.
- Sudden-onset vertigo.
- Loss of balance.
- Difficulty walking.
- Double vision.
- Loss of vision.
- Difficulty speaking.
- Difficulty swallowing.
- Weakness in the arms and legs.
- Facial or body numbness.
- Nausea and vomiting.
- Altered level of consciousness.
- Severe drowsiness.
When the artery is completely blocked, symptoms usually progress rapidly and can be life-threatening.
Locked-in syndrome
One of the most well-known complications of basilar artery occlusion is locked-in syndrome.
In this condition, the person remains conscious but loses almost all ability to move the body and speak due to damage to the brainstem.
In many cases, only vertical eye movements and blinking are preserved, becoming the person’s only means of communication.
Although this is a rare complication, it illustrates how severe this type of stroke can be.
How is it diagnosed?
Diagnosis requires an urgent neurological assessment and imaging tests.
The main tests include:
- Computed tomography (CT).
- Magnetic resonance imaging (MRI).
- CT angiography (CTA).
- Magnetic resonance angiography (MRA).
- Cerebral angiography.
- Cardiac tests when an embolic origin is suspected.
Early identification of the occlusion allows treatment options aimed at restoring blood flow to be considered.
Treatment
The speed at which treatment is provided is one of the most important factors in improving prognosis.
Treatment options may include:
- Intravenous thrombolysis in selected patients.
- Mechanical thrombectomy to remove the blood clot.
- Blood pressure management.
- Treatment of complications.
- Intensive care when necessary.
In recent years, mechanical thrombectomy has expanded treatment options for certain patients with basilar artery occlusion.
Possible long-term effects
The long-term effects will depend on the duration of ischemia and the extent of brain damage.
The most common include:
- Balance problems.
- Coordination problems.
- Difficulty walking.
- Visual disturbances.
- Muscle weakness.
- Difficulty speaking.
- Difficulty swallowing.
- Persistent fatigue.
- Cognitive deficits.
- Dependence on others for activities of daily living.
The severity can range from mild symptoms to significant disability.
Rehabilitation
Recovery requires a multidisciplinary rehabilitation program tailored to each patient.
It may include:
- Physiotherapy.
- Occupational therapy.
- Speech and language therapy.
- Vestibular rehabilitation.
- Neuropsychological rehabilitation.
- Psychological support.
The intensity of rehabilitation will depend on the patient’s long-term effects and clinical progress.
Prognosis
The prognosis of basilar artery occlusion depends mainly on:
- How quickly the condition is diagnosed.
- The time taken to restore blood flow.
- The extent of the cerebral infarction.
- The patient’s age.
- Associated medical conditions.
Advances in reperfusion techniques have improved outcomes for many patients, particularly when treatment is initiated within the first few hours.
Conclusion
Basilar artery occlusion is one of the most serious neurological emergencies because it compromises blood flow to essential structures of the brain, such as the brainstem and cerebellum. Symptoms can progress rapidly and require immediate medical attention to increase the chances of recovery.
Early diagnosis, reperfusion treatments when indicated, and specialized rehabilitation are essential to improve prognosis and support functional recovery in people who survive this type of stroke.
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