Screen reader users, click the load entire article button to braddom physical medicine and rehabilitation 5th edition pdf download dynamically loaded article content. Please note that Internet Explorer version 8. Click the View full text link to bypass dynamically loaded article content. This chapter presents an overview of somatosensory and motor evoked potentials.
When an appropriate peripheral nerve or dermatome is stimulated, an SSEP is generated along the neuroaxis progressing to a specific topography in the cortex. These potentials are made up of various components that occur at different latencies. Ideally, the components are labeled according to polarity and latency. In most instances, the mean latency of a particular component is used to identify the potential, no matter what the absolute latency for a given subject. A variety of electrodes can be used to record SSEPs.
Gold or silver-silver chloride EEG cup electrodes are preferred to platinum needle or clip EEG electrodes because of their lower impedance. Needle and clip electrodes, on the other hand, are quicker to place and secure, particularly in the intraoperative setting. This article has not been cited. Published by the BMJ Publishing Group Limited. Neck pain imposes a considerable personal and socioeconomic burden—it is one of the top five chronic pain conditions in terms of prevalence and years lost to disability—yet it receives a fraction of the research funding given to low back pain. Although most acute episodes resolve spontaneously, more than a third of affected people still have low grade symptoms or recurrences more than one year later, with genetics and psychosocial factors being risk factors for persistence.