Adson's sign

Adson's sign is a medical test used primarily in the diagnosis of thoracic outlet syndrome (TOS). The test is named after American neurologist Alfred Washington Adson.

Procedure

The Adson's test is performed by having the patient elevate their chin, turn their head to the side of the symptoms, and take a deep breath and hold it. The physician then takes the radial pulse on the same side. If the pulse disappears or diminishes, this is a positive Adson's sign.

Interpretation

A positive Adson's sign suggests that the subclavian artery and/or brachial plexus is being compressed in the scalene triangle, which is a common site of compression in thoracic outlet syndrome.

Limitations

The Adson's test has been criticized for its lack of specificity and sensitivity. It is often positive in healthy individuals and can be negative in patients with thoracic outlet syndrome. Therefore, it should not be used as a standalone test for diagnosing TOS.

See also

• Thoracic outlet syndrome
• Alfred Washington Adson
• Scalene triangle
• Subclavian artery
• Brachial plexus

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