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Orthodromic sensory conduction along the ring finger in normal subjects and in patients with a carpal tunnel syndrome

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The purpose of the present study was to examine the value of measuring sensory conduction along the median and ulnar nerves of the fourth finger in the diagnosis of a carpal tunnel syndrome (CTS). In 23 controls, sensory conductions along median and ulnar nerves were identical. In 28 of 38 patients with CTS, stimulation of the ring finger revealed a reduced conduction velocity along sensory median nerve fibres in contrast to normal conduction along ulnar sensory nerve fibers. In 5 patients, a sensory action potential was absent over the median nerve and in another 5 sensory conduction was normal along both nerves. We conclude that testing of sensory conduction along the ring finger is useful in about 74% of patients with CTS, while in the remaining 26% other fingers must be examined to establish the diagnosis.

OriginalsprogEngelsk
TidsskriftElectroencephalography and Clinical Neurophysiology/ Evoked Potentials
Vol/bind81
Udgave nummer1
Sider (fra-til)18-23
Antal sider6
ISSN0168-5597
DOI
StatusUdgivet - 1 jan. 1991

ID: 201455978