Most patients with thoracic outlet syndrome can be treated conservatively without surgery in a successful fashion. In general, patients with neurogenic thoracic outlet syndrome should be given physiotherapy when the diagnosis is made. Proper physiotherapy includes heat massages, active neck exercises, stretching of the scalenus muscles, strengthening of the upper trapezius muscle, and posture instruction. Because sagging of the shoulder girdle, which is common among middle-aged people, is a major cause in this syndrome, many patients with less severe cases are improved by strengthening the shoulder girdle and by improving posture. Most patients with thoracic outlet syndrome who have ulnar nerve conduction velocities (UNCVs) of more than 60 meters per second (mps) improve with conservative management. 2 If the conduction velocity is below that level, most patients, despite physiotherapy, may remain symptomatic, and surgical resectionofthefirstribandcorrectionofotherbonyabnormalities may be needed to provide relief of symptoms. If symptoms of neurovascular compression continue after physiotherapy, and the conduction velocity shows slight or no improvement or regression, surgical resection of the first rib and cervical rib, when present, should be considered. The transaxillary route is an expedient approach for complete removal of the first rib with decompression of the seventhandeighthcervicalandfirstthoracicnerverootsandthe lower trunks of the brachial plexus. First rib resection can be performed without the need for major muscle division, the needforretractionofthebrachialplexus,andthedifficultyof removing the posterior segment of the rib. In addition, first rib resection shortens the postoperative disability and provides better cosmetic results than the anterior and posterior approaches, particularly because 80% of patients are female.
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