Evidence for Conduction Delay in Thoracic-Outlet Syndrome Is Challenged

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To the Editor: Because we have been unable lo detect conduction slowing across the thoracic outlet in patients with suspected thoracic-outlet syndrome, we are writing regarding an article (May 25, 1972, issue) by Urschel and Razzuk.1 We were puzzled by their Figure 2B (a photograph of four stacked tracings obtained by recording over the hypothenar area while stimulating the ulnar nerve at progressively more proximal points), which allegedly demonstrates slowing across the thoracic outlet in a patient with the thoracic-outlet syndrome; specifically, the supraclavicular fossa/fourth response seems markedly delayed as compared with the mid-upper arm/third response. However, we have concluded . . .

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