Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology
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Clinical Trial
Localization of ulnar neuropathy at the elbow using new stimulator for the inching test.
To evaluate the usefulness of the TenElectrodes, a new stimulator for inching test, in the diagnosis and localization of ulnar neuropathy at the elbow (UNE). ⋯ TenElectrodes is a useful stimulator for the inching test in the diagnosis of UNE. The precise localization of compression was possible in all patients with UNE and the most common site was the retroepicondylar groove.
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Carotid endarterectomy is a common procedure as a secondary prevention of stroke, and one of the early controversies in carotid surgery is centered around whether a shunt should be used during this procedure. Although various EEG parameters have been proposed to determine if the brain is at risk during carotid artery clamping, the common procedure is still the visual assessment of the EEG. We propose a brain symmetry index (BSI), that has been implemented as an on-line quantitative EEG parameter, as an additional criterion for shunt need in carotid endarterectomy. ⋯ The BSI may assist in the visual EEG analysis during carotid endarterectomy and provides a quantitative measure for electroencephalographic asymmetry due to cerebral hypo-perfusion. In patients with a change in the BSI (DeltaBSI) smaller than 0.03 during test clamping, visual EEG analysis showed no changes, whereas if visual EEG analysis did warrant shunting, it was found that DeltaBSI>or=0.06.
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This study investigated a strategy to elicit reversible facilitation of the soleus monosynaptic H-reflex in humans using a modified tetanic stimulation technique. ⋯ This technique may be used in future studies to investigate whether the induced increased H-reflex excitability influences locomotion.
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Electroencephalographic (EEG) peak alpha frequency (PAF) (measured in Hz) has been correlated to cognitive performance between healthy and clinical individuals, and among healthy individuals. PAF also varies within individuals across developmental stages, among different cognitive tasks, and among physiological states induced by administration of various substances. The present study suggests that, among other things, PAF reflects a trait or state of cognitive preparedness. ⋯ PAF was shown to detect both trait and state differences in cognitive preparedness, as well as to be affected by cognitive tasks. Traits are better reflected during post-task rest, whereas states are better reflected during initial resting baseline recordings.
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This study sought to determine whether certain aspects of after-discharges (ADs) obtained during cortical functional mapping provide better correlations between stimulus site and that of spontaneous seizures. Secondly, we wished to determine the percentage of stimulations evoking ADs and, of these, the percentage which clearly involves more than one electrode position, potentially inaccurately localizing cortical function. Thirdly, we wished to quantify the incidences of the several AD morphologies described by Jasper [in: Epilepsy and the functional anatomy of the human brain, 1954, p. 183; p. 692] and to assess whether certain morphologies had a greater tendency to evolve in frequency or morphology. ⋯ These data illustrate the need for scrutiny of the post-stimulus electrocorticogram for ADs and particularly those involving extra stimulus sites. Whether varying the stimulus parameters prospectively will disclose a better seizure localizing value for ADs remains to be determined.