BACKGROUND: Monitoring of corticocortical evoked potentials (CCEPs) during brain tumor
surgery of patients under anesthesia was recently reported to be effective in assisting
in preservation of speech function. The aim of this study was to investigate whether
CCEPs can be reproducibly measured between the frontal and temporal lobes during standard
intracranial vascular surgery under general anesthesia; whether dynamic changes in
CCEPs caused by reduced focal cerebral blood flow can be measured; and whether CCEPs
can be used to monitor speech function, particularly associated with the left side
of the brain.