Subclavian Steal Syndrome
Subclavian steal syndrome is a complex disorder of the arteries that occur when there is a present occlusion or stenosis of the subclavian artery attached to the vertebral artery origin. When an occlusion or stenosis occurs, a reversed flow of blood occurs in the ipsilateral vertebral artery, causing a variety of health issues. In subclavian steal syndrome, blood is constantly being stolen by the distal territory of the stenosed or occluded artery from the circular vertebrobasilar system.
During the innominate or subclavian artery stenosis, a retrograde flow of blood is witnessed in the vertebral artery that of which may be found using a Doppler ultrasound examination in the cerebral supply.
Some doctors and medical professionals tend to use the term of subclavian steal syndrome too loosely. The term of subclavian steal syndrome must only be used in cases where this abnormal flow of blood causes a variety of neurological symptoms. This phenomenon is related to the decreased cerebral perfusion that occurs when the arm on the same side of the body as the subclavian stenosis is exercised.
Subclavian steal syndrome and its information
Prevalence of the Disorder
Subclavian stenosis disorder is a relatively rare disorder. There are only about 2% in today’s population and about 7% of the clinical population that suffer from subclavian stenosis. On most cases, SSP or subclavian steal phenomenon is only incidentally found during sonography conducted in the vertebral system. About 2% to 5% of those who are examined are discovered this way. Of all these incidents, only 5% of the patients actually manifested symptoms of subclavian stenosis syndrome.
Who Are At Risk of Subclavian Stenosis Syndrome
A majority of subclavian stenosis cases are caused by atheroscleroris, and the risk factors associated with subclavian stenosis phenomenon are very much similar to the risk cases associated with cardiovascular disease. Among these risk factors include the family history of developing the disease; hence, genes play a part in the development of this disorder. Smokers are also at risk of developing subclavian stenosis, as well as people who suffer from diabetes, hypertension, or hyperlipidaemia. One interesting fact is that in Asia, a huge chunk of those with subclavian stenosis syndrome develops the disorder because of Takayasus arteritis. Those who are afflicted by these tend to be young people, less than thirty years of age, and are mostly female. In Europe, however, Takayasus arteritis is a very rare occurrence.
Symptom of Subclavian Stenosis Syndrome
Most of the symptoms of the subclavian stenosis phenomenon are related to posterior and vertebrobasilar cerebral circulation ischaemia. People who try to exercise the upper limb on the part that is affected may experience a variety of symptoms. Among the symptoms of subclavian stenosis include:
Visual loss, which may range from total blinded to unilateral visual field loss or amaurosis fugax.
Vertigo, a type of dizziness that is associated with the fake sensation of one’s surroundings or oneself spinning or moving. Vertigo causes loss of balance and nausea to those who are affected.
Fleeting moments of diplopia, dysarthria, ataxia, and dysphagia
Pulsatile tinnitus
A feeling of numbness or tingling on the face, transient hemiparesis, or sensory hemianaesthesia
Arm claudication is occurring at irregular intervals. It is worthwhile to note that rest pain is not a symptom usually associated with subclavian stenosis. If you’re experiencing rest pain, atheroembolism may be the cause.
Syncope or drop attacks: drop attacks causes the affected to fall to the floor spontaneously which may equate to the loss of consciousness coupled with an immediate recovery.
For some people, neck movements may also be the cause for symptoms.
Signs You Must Look For
Subclavian steal syndrome may be discovered using a variety of methods. One sign worth noting is the reduction of blood pressure on the located arm. On the side of the arm with subclavian steal, blood pressure is usually decreased to about >20 Hg. Examine ulnar and radial pulses, and then elevate the arm at the point where the pulses can become felt to diminish. On a majority of cases of genuine subclavian steal syndrome, a difference in blood pressure is examined in the affected arm. Genuine cases must be able to show a difference in the blood pressure of both arms. Another effective method to determine the presence of subclavian steal is search for a subclavian bruit.
Additional Information
Subclavian stenosis syndrome is often misdiagnosed to be a variety of other disorders. Among these disorders include Takayasus arteritis, aortic dissection, thromboembolism, atherosclerosis, Giant cell arteritis, and other cerebral or cerebellar pathology such as tumors or multiple sclerosis. Subclavian stenosis may be discovered using CT angiography, colour Doppler ultrasound, ECG, or CXR.
Treatments for Subclavian Stenosis Syndrome
Subclavian steal may be treated in a number of ways, depending on the case being dealt with. Percutaneous transluminal angioplasty or carotid-subclavian bypass incorporated with synthetic graft, carotid-subclavian transposition, or saphenous vein graft can be employed in order to bypass the present stenosis present in the subclavian artery.
A variety of endovascular methods are also becoming more and more popular these days for the treatment of subclavian steal. Endovascular methods are the chosen treatment procedures for patients categorized as high risk because of its minimally invasive approach that is conducted only under local anaesthetic. With angioplasty, 4% of all cases develop consequences. At times when the symptoms manifested by the patient are not deemed as severe, conservative management is the treatment method of choice.
Are All Treatments Necessary?
Some cases of subclavian steal spontaneously and naturally resolve due to the development of extracranial collaterals in the subclavian circulation. Therefore, the decision to employ treatment for patients that are symptomatic are not always clear. Treatment is generally only employed on patients that have debilitating and severe transient ischaemic attacks. In most cases, subclavian steal syndrome can improve using only medical therapy, eliminating the need to for more invasive forms of treatment. At times when medical therapy does not produce positive results, angioplasty is the next choice in order to relieve the patients of the symptoms associated with subclavian steal syndrome.
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