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• W2489773954 abstract "Purpose: Hyperventilation (HV) is a commonly used electroencephalogram activation method. Methods: We analyzed EEG recordings in 22 normal subjects and 22 patients with focal epilepsy of unknown cause. We selected segments before (PRE), during (HYPER), and 5 minutes after (POST) HV. To analyze the neural generators of EEG signal, we used standard low-resolution electromagnetic tomography (sLORETA software). We then computed EEG lagged coherence, an index of functional connectivity, between 19 regions of interest. A weighted graph was built for each band in every subject, and characteristic path length (L) and clustering coefficient (C) have been computed. Statistical comparisons were performed by means of analysis of variance (Group X Condition X Band) for mean lagged coherence, L and C. Results: Hyperventilation significantly increases EEG neural generators ( P < 0.001); the effect is particularly evident in cingulate cortex. Functional connectivity was increased by HV in delta, theta, alpha, and beta bands in the Epileptic group ( P < 0.01) and only in theta band in Control group. Intergroup analysis of mean lagged coherence, C and L, showed significant differences for Group ( P < 0.001), Condition ( P < 0.001), and Band ( P < 0.001). Analysis of variance for L also showed significant interactions: Group X Condition ( P = 0.003) and Group X Band ( P < 0.001). Conclusions: In our relatively small group of epileptic patients, HV is associated with activation of cingulate cortex; moreover, it modifies brain connectivity. The significant differences in mean lagged coherence, path length, and clustering coefficient permit to hypothesize that this activation method leads to different brain connectivity patterns in patients with epilepsy when compared with normal subjects. If confirmed by other studies involving larger populations, this analysis could become a diagnostic tool in epilepsy." @default.
• W2489773954 created "2016-08-23" @default.
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• W2489773954 date "2017-01-01" @default.
• W2489773954 modified "2023-10-03" @default.
• W2489773954 title "Hyperventilation in Patients With Focal Epilepsy" @default.
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• W2489773954 doi "https://doi.org/10.1097/wnp.0000000000000329" @default.
• W2489773954 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27490325" @default.
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