Abstract
IN 1972, the Journal published a Current Concepts article, "Management of the Thoracic-Outlet Syndrome," which recommended measurement of the ulnar-nerve conduction velocity across the thoracic outlet as a reliable indicator of the presence and severity of nerve compression.1 The authors of that article, Harold C. Urschel, Jr., and Maruf A. Razzuk, included a figure with a legend that identified it as a tracing from a patient with the thoracic-outlet syndrome, illustrating the slowing of nerve conduction across the obstruction.In the Correspondence section of this week's issue, Wilbourn and Lederman now challenge the validity of that figure, suggesting that it . . .

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