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Thoracic Outlet Syndrome: Causes, Symptoms & Treatment
Thoracic outlet syndrome (TOS) is a condition in which nerves or blood vessels are compressed between the collarbone and the first rib, causing pain, numbness, or circulatory problems in the arm and shoulder.
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Thoracic outlet syndrome (TOS) is a condition in which nerves or blood vessels are compressed between the collarbone and the first rib, causing pain, numbness, or circulatory problems in the arm and shoulder.
What is Thoracic Outlet Syndrome?
Thoracic outlet syndrome (TOS) refers to a group of conditions caused by compression of nerves, arteries, or veins in the thoracic outlet -- the narrow space between the collarbone (clavicle), the first rib, and the surrounding muscles. This compression can lead to pain, tingling, weakness, and circulatory disturbances in the shoulder, arm, and hand.
Causes
Several factors can contribute to the development of thoracic outlet syndrome:
- Anatomical variations: Extra cervical ribs or abnormally shaped muscles can narrow the thoracic outlet.
- Muscle tightness: Overuse or poor posture can lead to tightening of the scalene muscles, which may compress nerves and vessels.
- Injuries: Clavicle fractures, whiplash injuries, or repetitive strain can trigger TOS.
- Occupational factors: Jobs requiring overhead work or repetitive arm movements increase the risk.
- Obesity or pregnancy: Changes in body posture can worsen compression in the thoracic outlet.
Types of Thoracic Outlet Syndrome
TOS is classified based on which structure is compressed:
- Neurogenic TOS: The most common form, accounting for over 95% of cases. Compression of the brachial plexus causes pain, tingling, and weakness in the arm and hand.
- Venous TOS: Compression of the subclavian vein leads to arm swelling, discoloration, and in severe cases, deep vein thrombosis (Paget-von-Schroetter syndrome).
- Arterial TOS: The rarest form. Compression of the subclavian artery can reduce blood flow, causing pallor, coldness in the fingers, and in severe cases, arterial occlusion.
Symptoms
Symptoms vary depending on the type of TOS but may include:
- Pain in the neck, shoulder, arm, or hand
- Tingling, numbness, or burning sensations (especially in the 4th and 5th fingers)
- Weakness or fatigue in the arm, particularly during overhead activities
- Swelling or skin discoloration in the arm (venous TOS)
- Pale, cold, or bluish fingers (arterial TOS)
- Weak or absent pulse in the affected arm
Diagnosis
Diagnosing TOS can be challenging because its symptoms overlap with many other conditions. A thorough evaluation includes:
- Physical examination: Provocation tests such as the Adson test, Roos test, or Wright test can reproduce symptoms and support the diagnosis.
- Imaging: X-rays of the neck and chest can reveal cervical ribs or other structural abnormalities. MRI or CT scans provide detailed information about soft tissues and vessels.
- Vascular studies: Doppler ultrasound, angiography, or phlebography are used when arterial or venous involvement is suspected.
- Electrodiagnostic testing: Nerve conduction studies (NCS) and electromyography (EMG) help confirm nerve compression.
Treatment
Conservative Treatment
For most patients, especially those with neurogenic TOS, conservative management is the first line of treatment:
- Physical therapy: Targeted stretching and strengthening exercises for the shoulder and neck muscles, along with posture correction, are the cornerstone of treatment.
- Pain management: Nonsteroidal anti-inflammatory drugs (NSAIDs) or other analgesics help relieve discomfort.
- Ergonomic adjustments: Modifying the workplace setup and avoiding aggravating activities.
- Heat therapy and massage: Supportive measures to relieve muscle tension.
Surgical Treatment
Surgery may be necessary if conservative measures fail after several months or if arterial or venous TOS causes serious complications:
- First rib resection: The most common surgical procedure, in which the first rib is removed to decompress the thoracic outlet.
- Cervical rib removal: Indicated when an anatomical cervical rib is the underlying cause.
- Scalenectomy: Division of the anterior scalene muscle to relieve pressure.
- Thrombectomy or thrombolysis: Used in venous TOS complicated by thrombosis.
Prognosis
The majority of patients respond well to conservative therapy. Surgical treatment leads to significant improvement in most cases. Early diagnosis is essential to prevent long-term complications such as permanent nerve damage or vascular thrombosis.
References
- Illig K.A. et al. - Thoracic Outlet Syndrome. Springer, 2nd Edition (2021).
- Kuhn J.E. et al. - Thoracic outlet syndrome. In: Journal of the American Academy of Orthopaedic Surgeons, 2006; 14(4): 235-247.
- Freischlag J., Orion K. - Understanding Thoracic Outlet Syndrome. In: Scientifica, 2012; doi:10.6064/2012/248163.
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