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Laboratory Reference for Clinical Neurophysiology$
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Jay A. Liveson and Dong M. Ma

Print publication date: 1999

Print ISBN-13: 9780195129243

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780195129243.001.0001

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Somatosensory Evoked Responses

Somatosensory Evoked Responses

(p.278) Chapter 12 Somatosensory Evoked Responses
Laboratory Reference for Clinical Neurophysiology

Jay A. Liveson

Dong M. Ma

Oxford University Press

The setup for somatosensory evoked response is almost identical for all studies. Recording techniques for the upper extremity nerves and dermatomes are fairly interchangeable. These differ from lower extremity recordings, which, however, are all similar. Different nerves are tested by using different stimulation points. Surface disk electrodes are localized near the appropriate nerve. In the case of the median nerve, the cathode is placed between the tendons of the palmaris longus and flexor carpi radialis. This is placed between the stimulating and the recording electrodes, relatively close to the former. Either a surface electrode or a band around the forearm is convenient. The patient is placed in a supine position and instructed to gently close his or her eyes while relaxing all head and neck muscles. The recording may be improved if the patient tries to concentrate on the stimuli.

Keywords:   somatosensory evoked response, extremity nerves, dermatomes, median nerve, palmaris longus, flexor carpi radialis, tendons

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