Vertebrobasilar insufficiency (patient information)

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What is Vertebrobasilar insufficiency?

Vertebrobasilar insufficiency refers to conditions in which blood supply to the back of the brain is disrupted.

What are the symptoms of Vertebrobasilar insufficiency?

• Difficulty keeping your balance
• Difficulty swallowing
• Difficulty walking
• Double vision or vision loss
• Headache
• Hearing loss
• Nausea and vomiting
• Neck ache
• Numbness or tingling
• Poor coordination
• Sleepiness or even apparent sleep from which the person can not be awakened
• Slurred speech
• Stroke or transient ischemic attack
• Vertigo (sensation of things spinning around)

What causes Vertebrobasilar insufficiency?

The vertebrobasilar system is also called the back (posterior) circulation of the brain. Three main blood vessels provide blood flow to the back of the brain:

• One basilar artery
• Two vertebral arteries

The back of the brain contains structures that are crucial for keeping a person alive. For instance, the brainstem controls breathing and swallowing, among other things. Parts of the brain help with vision (occipital lobes) and movement coordination (cerebellus) are also located in the back of the brain.

Many different conditions may cause blood flow in the back part of the brain to be reduced or stopped. The most common cause is a stroke due to hardening of the arteries (atherosclerosis).

Vertebrobasilar vascular disorders may also be caused if a tear (dissection) in an artery wall leads to the release of a clot that blocks blood flow. Dissection can be caused by clogged arteries, conditions such as fibromuscular dysplasia, or injuries such a car accident. It may even be caused by manipulations of the neck by a chiropractor, or during massage. However, most of the time, no apparent cause of dissection can be identified. When vertebrobasilar disease is present in a younger person, dissection of one of the arteries is often the cause.

Other less common causes of vertebrobasilar vascular disorders include connective tissue diseases and vasculitis.

How do I know I have Vertebrobasilar insufficiency?

Tests depend on the possible underlying cause, but may include:

• CT or MRI of the brain
• Computed tomography angiography (CTA), magnetic resonance angiography (MRA) or ultrasound to look at blood vessels in the brain
• Blood tests, including blood clotting studies
• Echocardiogram
• Electrocardiogram (ECG) and Holter monitor
• Lumbar puncture (spinal tap) -- rarely needed
• X-rays of the arteries (angiogram)

When to seek urgent medical care

Call 911 or your local emergency number, or get to the emergency room if you have any symptoms that may suggest a vertebrobasilar insufficiency.

Treatment options

Sudden onset of vertebrobasilar symptoms is a medical emergency that requires immediate treatment. For treatment information, see:

• Transient ischemic attack
• Stroke

Several possible treatments are available for treating symptoms due to off and on (intermittent) narrowing of the blood vessels. However, there is generally no good surgical treatment for patients who have narrowing of the vertebrobasilar arteries. Blood pressure may be permanently raised to make sure enough blood gets to that part of the brain or blood thinners may be used to make sure additional clots do not form.

Where to find medical care for Vertebrobasilar insufficiency

Directions to Hospitals Treating Vertebrobasilar insufficiency

Sources

http://www.nlm.nih.gov/medlineplus/ency/article/001423.htm