Somatosensory evoked potentials for the diagnosis of proximal sensory median neuropathy with preserved distal sensory action potential. 2003

P E Merle, and N Joan, and O Varnet, and D Dupuy-Sonntag, and B Perin, and J M Macron
Department of Clinical Neurophysiology, Centre Hospitalier Universitaire, Hôpital Nord, 80054 Amiens. merle.philippe@chu-amiens.fr

A 33 year-old-man with paresthesia in first three fingers of the right hand after minor trauma of the arm was examined electrophysiologically. The proximal sensory median neuropathy was isolated which it is unusual in traumatic lesion. Motor and distal sensory conduction studies were normal but sensory evoked potentials (SEPs) were abnormal by right median nerve stimulation at the wrist level with decrease in amplitude of peripheral potential at the Erb's point, the cervical and contralateral parietal levels. This pattern, preserved distal sensory action potential and abnormal peripheral SEPs were suggesting the presence of proximal sensory block conduction without wallerian degeneration. The recovery was complete and fast in correlation with the absence of axonopathy.

UI MeSH Term Description Entries
D008297 Male Males
D005073 Evoked Potentials, Somatosensory The electric response evoked in the CEREBRAL CORTEX by stimulation along AFFERENT PATHWAYS from PERIPHERAL NERVES to CEREBRUM. Somatosensory Evoked Potentials,Evoked Potential, Somatosensory,Somatosensory Evoked Potential
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000200 Action Potentials Abrupt changes in the membrane potential that sweep along the CELL MEMBRANE of excitable cells in response to excitation stimuli. Spike Potentials,Nerve Impulses,Action Potential,Impulse, Nerve,Impulses, Nerve,Nerve Impulse,Potential, Action,Potential, Spike,Potentials, Action,Potentials, Spike,Spike Potential
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D012677 Sensation The process in which specialized SENSORY RECEPTOR CELLS transduce peripheral stimuli (physical or chemical) into NERVE IMPULSES which are then transmitted to the various sensory centers in the CENTRAL NERVOUS SYSTEM. Sensory Function,Organoleptic,Function, Sensory,Functions, Sensory,Sensations,Sensory Functions
D020423 Median Neuropathy Disease involving the median nerve, from its origin at the BRACHIAL PLEXUS to its termination in the hand. Clinical features include weakness of wrist and finger flexion, forearm pronation, thenar abduction, and loss of sensation over the lateral palm, first three fingers, and radial half of the ring finger. Common sites of injury include the elbow, where the nerve passes through the two heads of the pronator teres muscle (pronator syndrome) and in the carpal tunnel (CARPAL TUNNEL SYNDROME). Median Nerve Diseases,Medial Neuropathy, Distal,Median Mononeuropathy,Median Nerve Entrapment,Median Nerve Entrapment Neuropathy,Median Nerve Neuralgia,Median Nerve Neuropathy,Median Neuropathy, Proximal,Neuropathy, Median,Distal Medial Neuropathies,Distal Medial Neuropathy,Entrapment, Median Nerve,Median Mononeuropathies,Median Nerve Disease,Median Nerve Entrapments,Median Nerve Neuralgias,Median Nerve Neuropathies,Median Neuropathies,Mononeuropathy, Median,Nerve Disease, Median,Nerve Entrapment, Median,Nerve Neuropathy, Median,Neuralgia, Median Nerve,Neuropathy, Distal Medial,Neuropathy, Median Nerve,Neuropathy, Proximal Median,Proximal Median Neuropathies,Proximal Median Neuropathy

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