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Thoracic Outlet Syndrome

Thoracic outlet syndrome (TOS) is when you have pain, swelling, or other symptoms from compression in your thoracic outlet — the opening between your lower neck and upper chest. It can cause numbness and tingling in your arms or pain in your shoulders, especially when you raise your arms.

The thoracic outlet is the narrow space between your collarbone and top rib. Muscles run through it from your neck to your Shoulder, along with the nerves and blood  vessels that go down your arm. When something presses on them, you can have pain and other symptoms.

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Thoracic Outlet Syndrome Types

There are 3 types of thoracic outlet syndrome:

  • Neurogenic: Affects nerves leading from the spinal cord to the neck to the arm. Most thoracic outlet syndrome cases involve nerves.
  • Venous: Affects veins
  • Arterial: Affects arteries

About 95% of thoracic outlet syndrome cases involve nerves. It’s rare but more serious when it affects a vein or an artery.

The condition is more common in women. It’s also often seen in athletes and workers who make repeated arm motions. But it can affect anyone.

Thoracic Outlet Syndrome Symptoms

You’re most likely to feel them in your arms and hands. They include:

  • Pain in the neck, shoulder, or arm
  • Numbness and tingling
  • Swelling
  • Weakness
  • Discoloration — blue, red, or pale
  • Cold hands
  • Atrophy (when the tissue or muscle in your arm starts to waste away)
  • Weak pulse in your affected arm
  • Painful lump near your collarbone
  • Shrinking of the muscle in the fleshy base of your thumb (also called Gilliatt-Sumner hand)

Thoracic Outlet Syndrome Causes and Risk Factors

There are several causes:

  • Injuries: Whiplash a broken collarbone, or other injury can leave scar tissue and inflammation .
  • Poor posture: When your shoulders slump, your collarbones can move out of place and press on your nerves. Weak shoulder muscles can cause bad posture.
  • Repetitive stress: It can affect people who move their arms in a certain way over and over again.
  • Physical defects: Some people are born with an extra rib or a thoracic outlet that’s smaller than normal.
  • Obesity : Extra weight  can put stress on the muscles that support your collarbones.
  • Pregnancy: TOS can happen as your joints begin to get looser.
  • Sleep disorders
  • Tumors, especially in your upper chest or under your arm
  • Stress or depression

TOS is found more often in women than in men and primarily in young people, mostly ages 20-40. Athletes who move their arms in the same way a lot, like swimmers or baseball pitchers, also can be more likely to have it.

Thoracic Outlet Syndrome Diagnosis

Your doctor will start by asking questions to get a detailed history of your symptoms and then do a physical exam.

Neurogenic: This type isn’t always easy to spot. Things can compress the nerves that serve your arms and hands in different places for a variety of reasons. The symptoms will be the same, but the problem could be arthritis in your neck, a pinched nerve , or carpal tunnel syndrome . Other conditions like a damaged rotator cuff , fibromyalgia, and multiple sclerosis can cause pain and numbness in your shoulders and arms. Another example is thinning or wasting of the muscle at the base of the thumb. This can happen with carpal tunnel syndrome too.

Venous and arterial: These symptoms are more obvious. Blood doesn’t circulate properly. You may even have a blood clot. Your arm or hand  may be swollen, and look either pale or bluish. You may have a weak pulse or no pulse in the affected arm.

Several kinds of tests can help with the diagnosis:

  • Positioning tests: The doctor will move your arms and head in different ways to see if the symptoms appear. One shortfall: These tests can also cause symptoms in healthy people.
  • Scalene muscle block: The doctor will give you a shot that relaxes muscles in this area to see if that makes the symptoms go away.
  • Imaging tests: An X-ray, CT scan , or MRI can reveal an extra rib or other abnormal physical feature. An ultrasound  can look for blockages or narrowing of blood vessels.
  • Nerve tests: Results are usually normal in people with this condition, but they can rule out other causes.
  • Blood circulation tests: An arteriogram or venogram (tests that use dyes and X-rays to see how blood flows in your system) can show blood clots or other damage to blood vessels.

Thoracic Outlet Syndrome Treatment 

Management of TOS depends on the type.

Neurogenic: The usual treatments are:

  • Physical therapy: You’ll do exercises to stretch and strengthen muscles in your neck and shoulders and improve your posture. This may be all you need to get relief.
  • Medication:The doctor may recommend that you use a muscle relaxant or that you take ibuprofen or naproxen  to ease pain and swelling. You may hear your doctor call these NSAID , or non-steroidal anti-inflammatory drugs.
  • Botox shots: A shot into the muscle at the base of your neck can relax the area and help ease pain. This can work for up to 3 months and be repeated if you need it.
  • Surgery is sometimes an option, but it doesn’t work nearly as well for this type of TOS.

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2021-11-30T10:38:05+00:00

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