The influence of anesthesia on cortico-cortical evoked potential monitoring network between frontal and temporo-parietal cortices.

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The influence of anesthesia on cortico-cortical evoked potential monitoring network between frontal and temporo-parietal cortices.

World Neurosurg. 2018 Dec 18;:

Authors: Suzuki Y, Enatsu R, Kanno A, Yokoyama R, Suzuki H, Tachibana S, Akiyama Y, Mikami T, Ochi S, Yamakage M, Mikuni N

Abstract
BACKGROUND: Previous studies have reported the usefulness of intraoperative cortico-cortical evoked potentials (CCEP) for preserving language function during brain surgery.
OBJECTIVE: This study aimed to assess the influence of depth of anesthesia on CCEP to establish its clinical utility.
METHODS: Twenty patients with brain tumors or epilepsy who underwent awake craniotomy were included in this study. Before resection, the electrode plates were placed on the frontal and temporo-parietal cortices, and 1-Hz alternating electrical stimuli were delivered to the pars opercularis/pars triangularis (pO/pT) in a bipolar fashion. Electrocorticograms from the temporo-parietal cortices time-locked to stimuli were averaged to obtain CCEP responses from a state of deep anesthesia until the awake state. The correlation between CCEP waveforms and bispectral index (BIS) was evaluated.
RESULTS: CCEP amplitude increased with the increase in BIS level. CCEP latency decreased in five patients and increased in 15 patients under anesthesia compared with the awake state. CCEP amplitudes decreased by 11.3-75.2% (median 31.3%) under anesthesia with < 65 BIS level. These differences were statistically significant (p<0.01, Wilcoxon signed-rank test). With respect to CCEP latencies, there was no significant difference between awake and anesthetic states.
CONCLUSION: CCEP amplitudes were correlated with depth of anesthesia, whereas CCEP latencies were not affected by anesthesia. The influence of anesthesia should be considered when applying this technique to intraoperative monitoring.

PMID: 30576824 [PubMed - as supplied by publisher]

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