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Release phenomenon - thoracic outlet
 The sensation of deep (painful) paraesthesia occuring as pressure is released from a nerve trunk.
Release phenomenon : the paraesthesia only appears after the compression has ceased.
There is a clear relationship between the duration of the compression and the length of the interval between cessation of compression and appearance of paraesthesia.
Example : standing up after sitting with the knees crossed for some time, immediately followed by paraesthesia. During compression there are no paraesthesia, they only appear when the compression is released. A similar mechanism is described in the thoracic outlet phenomenon.
The nervous structures in the distal half of the upper limb constitute an exception to the
release phenomenon : pressure on the median, ulnar and radial nerve immediately cause symptoms.
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