AI Article Synopsis
- A new electrophysiologic mapping technique helps identify the central sulcus and abnormal cortical regions in patients with tumors or epilepsy.
- Electrocorticographic recordings from 25 patients showed that low coherence was found across the central sulcus, confirming its location in 11 out of 12 cases analyzed.
- The technique also identified tumor locations in the sensory-motor region effectively and noted high coherence areas in epilepsy patients, though these did not correlate with mesial temporal lobe tumors or inter-ictal spiking.
Article Abstract
An electrophysiologic mapping technique which enables identification of the central sulcus and pathologic cortical regions is described. Electrocorticographic recordings of 1 min duration were recorded from 25 patients who were undergoing resection of tumors in the sensory-motor region or being evaluated for temporal lobectomy for epilepsy. Analysis of the patterns of subdural inter-electrode coherence revealed low coherence across the central sulcus for 11/12 cases where its location could be verified with direct cortical stimulation and/or somatosensory evoked potential mapping. Regions of high coherence identified the location of tumors in the sensory-motor region for 10/10 cases. Over the temporal lobe, localized areas of high coherence were evident in 8/9 epilepsy patients, but were not indicative of the location of mesial temporal lobe tumors or inter-ictal spiking, when present. We conclude that analysis of cortical coherence patterns may be helpful for revealing the location of pathologic processes relative to critical cortical areas.
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| http://dx.doi.org/10.1016/s0013-4694(97)00082-5 | DOI Listing |
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