Abstract
Objective To explore the sensitivity and specificity of electrocorticography (ECoG) in intraoperative mapping of motor cortices with the event-related potential (ERP) of slow cortical potential resting-state networks. Methods Thirteen patients with brain lesions near eloquent areas who were admitted to Department of Neurosurgery, Guangzhou General Hospital of Guangzhou Military Command from December 2014 to June 2016 were treated under awake craniotomy. The motor-related cortices were detected by intraoperative direct electrical stimulation. The ECoG were collected from patients in resting state. The ERP of slow cortical potential resting-state networks was analyzed. The sensitivity and specificity of ECoG in mapping of motor cortices were evaluated. Results Motor areas were identified by DES in all patients. The ERP of slow cortical potential resting-state networks was significant and regarded as the specific rhythm of motor cortex. When the threshold of ERP of the specific rhythm was chosen as 1.6, this method showed the optimal sensitivity (90.6%) and modest specificity (59.2%) compared with the other threshold. Conclusion Data analysis of the ERP of slow cortical potential resting-state networks from ECoG can be used to map motor areas intraoperatively, which is expected as a new adjunct to DES for intraoperative mapping. Key words: Brain diseases; Electrocorticography; Slow cortial potential; Mapping of motor cortices
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