{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,25]],"date-time":"2025-10-25T12:00:15Z","timestamp":1761393615276},"reference-count":25,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2007,10,2]],"date-time":"2007-10-02T00:00:00Z","timestamp":1191283200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Muscle and Nerve"],"published-print":{"date-parts":[[2008,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>In previous studies, changes in impulse transmission of ulnar motor axons have been documented in patients with carpal tunnel syndrome (CTS). We examined ulnar sensory conduction in 144 CTS hands. In particular, conduction parameters of the dorsal ulnar cutaneous branch (DUC) running outside Guyon's canal were compared with those of the superficial sensory branches (U4 and U5) passing through the canal. U4 and U5 response amplitudes and U5 conduction velocity were significantly lower than in controls. Conduction parameters of the DUC were similar in both groups. Patients with more severely impaired median conduction had smaller ulnar sensory action potentials. We propose that the ulnar nerve may be subject to compression in Guyon's canal as a consequence of high pressure in the carpal tunnel of CTS patients. This may provide insights into the mechanisms underlying extra\u2010median spread of sensory symptoms in CTS patients. 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