Electrodiagnostic Studies Role in Diagnosis and Management of Thoracic Outlet Syndrome
Keywords:Diagnosis, Thoracic outlet syndrome, Management, Iran
Introduction: Thoracic outlet syndrome (TOS) is caused by the compressive effect on brachial plexus or
subclavian vessels at the thoracic outlet. The symptoms are usually neurologic, arterial or venous or the
combination of them.
Method: From these patients we chose 70 patients whom underwent surgery (resection of first rib ,with
neurolysis with trans axillary approach) and we had the complete data on EMG -NCV and could follow
postoperative course and were completely satisfied by the operation and their symptoms was relieved
according the quick DASH Questionnaire and thereby the diagnosis of TOS was proved by the result.
Result: The electro diagnostic tests of 6 patients (1.5%) were completely normal. The lower trunk symptoms
which should be more frequent in TOS was purely present in 7.1%. Fibrillation and fasciculation along the
course of ulnar nerve was present in 10% of cases. The middle trunk abnormal motor NCV was the pure
pathology in2.9%. Fibrillation and fasciculation along the course of median nerve (abductor policis berevis)
2.4% and for
Brachioradialis (radial nerve) NCV was abnormal in 1.8%.
Conclusion: To prove this fact, we selected only the patients who were completely satisfied by the operation
and their symptoms was relieved according the quick DASH Questionnaire and thereby we were sure that
the diagnosis of TOS has been correct. Retrospectively we evaluated the electrodiagnostic findings in these
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