Thoracic Outlet Syndrome: Causes, Types, Symptoms, Risk Factors, Diagnosis, Treatment, Prevention and Complications

Thoracic outlet syndrome (TOS) is a group of illnesses where pressure accumulates on blood vessels or nerves in the area between the shoulder and neck. This region is referred to as the thoracic outlet. Compression of the blood vessels and nerves can cause pain in the shoulders and neck. It could also cause numbness in the fingers.

Auto accidents, repetitive stress injuries from sports, and pregnancy are the main causes of thoracic outlet syndrome. Anatomical differences such as having an extra or misaligned rib may potentially cause TOS. There are instances where the cause of thoracic outlet syndrome is not known.

Physical therapy and pain management are frequently included in treatment plans. The majority of individuals recover with these treatments. 

Causes Of Thoracic Outlet Syndrome

Compression of the blood vessels or nerves in the thoracic outlet, which is the space between the neck and shoulder, is frequently the cause of thoracic outlet syndrome. The following are some possible causes of compression:

• Variations in anatomy: A rib located above the first rib in the neck is absent in certain people from birth. Cervical ribs are additional ribs that might compress blood vessels or nerves. Compression may also be caused by a taut fibrous band that runs from the spine to the ribs.
• Poor posture: Carrying your head forward or drooping your shoulders might compress the thoracic outlet region.
• Trauma: Internal changes brought on by a car accident or other stressful event may compress the thoracic outlet nerves. It is typical for traumatic accident symptoms to take time to appear.

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Types Of Thoracic Outlet Syndrome

Following are mentioned three types of thoracic outlet syndrome:

• Neurogenic thoracic outlet syndrome: This type of thoracic outlet syndrome is the most common. This type includes compression of a group of nerves called the brachial plexus. The nerves in the brachial plexus are supplied by the spinal cord. The hand, arm, and shoulder nerves control the feeling and contraction of the muscles.
• Venous thoracic outlet syndrome: This type of thoracic outlet syndrome arises from injury and compression of one or more veins beneath the collarbone. As a result, blood clots could form.
• Arterial thoracic outlet syndrome: This type of TOS is the least common. It occurs when one of the arteries beneath the collarbone is compressed. The compression may cause damage to the artery, which could result in the formation of a blood clot or an aneurysm, a protrusion.

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Symptoms Of Thoracic Outlet Syndrome

The signs and symptoms of thoracic outlet syndrome might vary depending on the type. When nerves are squeezed, neurogenic thoracic outlet syndrome manifests as the following symptoms:

• The fingers or arm feel tingling or numb.
• Hand, shoulder, arm, or neck ache or pain.
• Fatigue in the arms after physical activity.

The following symptoms may be associated with venous thoracic outlet syndrome:

• Edema and pain in arms or hands.
• Hands or arms can show variation in colour.

The following symptoms may be brought on by arterial thoracic outlet syndrome:

• A lump around the collarbone.
• Cold hands, fingers, or appendages.
• Pain in Hands and Arms.
• A difference in color throughout one or more fingers or the hand in its entirety.
• There is no pulse or a faint pulse in the affected arm.

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Risk Factors Of Thoracic Outlet Syndrome

It appears that there are several characteristics associated with a higher prevalence of thoracic outlet syndrome, including:

• Sex: Women are diagnosed with thoracic outlet syndrome nearly three times more often than men.
• Age: Adults with thoracic outlet syndrome are most commonly diagnosed between the ages of 20 and 50, while it can occur at any age.

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Diagnosis Of Thoracic Outlet Syndrome

Diagnosing thoracic outlet syndrome may not be easy. Symptoms can vary greatly among people. In addition to examining you physically, your doctor may discuss your symptoms and medical history with you. There may also be a need for additional imaging tests.

• Physical assessment: Your healthcare professional searches for signs of thoracic outlet syndrome during a physical examination. These could be a hollow in your shoulder or the bony area above the collarbone. Your doctor might also examine your arm to look for any changes in color or edema. You may need to have your pulse and range of motion assessed.
• Your doctor might tell you to replicate your symptoms by moving, raising your arms, or turning your head. The positions and actions that elicit your symptoms can be used to diagnose thoracic outlet syndrome.
• Medical history: Tell the medical professional about your past medical history and symptoms. Your physical activities and job obligations can also be questioned.

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Imaging investigations and nerve tests

To confirm a diagnosis of thoracic outlet syndrome, one or more of the following tests can be necessary:

• Ultrasound: An ultrasound creates images of your body by using sound waves. When diagnosing thoracic outlet syndrome, it is often the first imaging test performed. This test can be used to diagnose venous or arterial thoracic outlet syndrome, as well as other vascular conditions.
• X-ray: There is an extra rib that shows up on an X-ray called the cervical rib. X-rays can also help rule out other conditions that could be causing your symptoms.
• CT (computerized tomography) scan: In a CT scan, cross-sectional images of your body are produced using X-rays. To obtain a more comprehensive image of the blood vessels, a dye may be injected into a vein during a process known as CT angiography. Blood vascular compression may be found and its cause determined using a CT scan.
• Magnetic resonance imaging is referred to as MRI: An MRI uses radio waves and magnetic fields to create a precise image of your body. An MRI may help determine the exact location and cause of blood vessel compression. Sometimes dye is injected to help see the blood vessels. An MRI can reveal anatomical differences like a fibrous band that extends from your spine to your ribs or a cervical rib. These structural variations may be the cause of your problems. Your head, shoulders, and neck may be arranged differently by a medical professional. You may be able to see the blood vessels in your arm more clearly as a result.
• Arteriography and venography: A small incision, usually in the groin, is made during these tests to insert a thin, flexible tube known as a catheter. During an arteriography, the catheter travels through your major arteries. During venography, the catheter travels through your veins. The catheter is put through the affected blood vessels. After that, an injection of dye is given to show X-ray images of your arteries and veins. If you have a squeezed vein or artery, medical professionals can diagnose it. To dissolve clots in veins or arteries, doctors can introduce medication using a catheter.
• ECG, or electrocardiogram: To record an EMG, an electrode needle is inserted under your skin into a variety of muscles. Your muscles' electrical activity is measured during the test when they're at rest. 

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Treatment Of Thoracic Outlet Syndrome

A conservative treatment regimen may be effective for most people, especially if the sickness is detected early. Potential therapy plan:

• Physical Therapy: Physical therapy is the initial line of treatment for neurogenic thoracic outlet syndrome. Engage in exercises that strengthen and stretch your shoulder muscles to open the thoracic outlet. This leads to an improvement in your range of motion and posture. These movements have the potential to reduce the strain on the blood vessels and nerves in the thoracic outlet with sustained use.
• Drugs: You might be given muscle relaxants, anti-inflammatory drugs, or painkillers. The drugs reduce edema, ease discomfort, and encourage muscular relaxation. If there is a blood clot, you might need to take a blood thinner.
• Anticoagulants: In patients with venous or arterial thoracic outlet syndrome, medication may be recommended to break up blood clots. Your veins or arteries will be shot with the drug, known as a thrombolytic, to dissolve blood clots. Anticoagulants, or medications that prevent blood clots, may be suggested by your doctor after thrombolytics have been administered.
• Injections: A local anesthetic injection, onabotulinum toxin (Botox), or a steroid medicine injection can be used to treat neurogenic thoracic outlet syndrome. Perhaps the shots will alleviate the agony.

Surgery

Surgery may be recommended by your healthcare professional if more conservative methods fail. Additionally, you might consider surgery if your symptoms are severe or chronic.

A surgeon with training in either chest surgery (thoracic surgeon) or blood vessel surgery (vascular surgeon) typically performs the method. One of the potential side effects of surgery for thoracic outlet syndrome is injury to the brachial plexus, a nerve network. Furthermore, surgery may not alleviate your symptoms at all or only partially, and they may even recur.

There are several ways to carry out thoracic outlet decompression, the surgical surgery used to treat thoracic outlet syndrome. These techniques involve removing a muscle and part of the first rib to alleviate compression. To repair damaged blood vessels, surgery can also be necessary.

In individuals with venous or arterial thoracic outlet syndrome, your surgeon may first use medicine to disintegrate blood clots before thoracic outlet decompression. On the other hand, surgery may be necessary to repair the vein or artery or to remove a clot from it. Before the procedure, thoracic outlet decompression is carried out.

A graft, or section of an artery removed from another part of your body, is used to do this. Another option is to use an artificial graft. This procedure could be carried out in tandem with the first rib extraction.

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Prevention Of Thoracic Outlet Syndrome

For those who have experienced thoracic outlet compression in the past, avoid heavy lifting and repetitive motions. Losing weight may help prevent or treat the symptoms of thoracic outlet syndrome if you are overweight.

Avoid throwing heavy bags over your shoulder, even if you do not exhibit any symptoms of thoracic outlet syndrome in yourself. This could lead to an increase in pressure on the thoracic outlet. Stretch your shoulders and perform shoulder flexion and strengthening exercises daily.

Daily stretches that focus on the chest, neck, and shoulders can improve shoulder muscular strength and prevent thoracic outlet syndrome.

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Complications Of Thoracic Outlet Syndrome

The nature of thoracic outlet syndrome is the reason behind its associated consequences. If you have painful discoloration or swelling in your arm, you should seek medical attention immediately. Blood clots or aneurysms may need medical treatment.

In neurogenic TOS, repetitive nerve compression can result in long-term harm that might cause persistent discomfort or dysfunction. Numerous muscle or joint conditions might be misdiagnosed as neurogenic TOS. If symptoms don't improve, it's imperative to seek medical attention for examination and testing.

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