Open AccessCarbogen inhalation during non-convulsive status epilepticus: A quantitative exploratory analysis of EEG recordings
Author(s) -
Sriharsha Ramaraju,
Simon Reichert,
Yujiang Wang,
Rob Forsyth,
Peter Neal Taylor
Publication year - 2021
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0240507
Subject(s) - carbogen , electroencephalography , inhalation , anesthesia , status epilepticus , medicine , audiology , epilepsy , oxygenation , psychiatry
Objective To quantify the effect of inhaled 5% carbon-dioxide/95% oxygen on EEG recordings from patients in non-convulsive status epilepticus (NCSE). Methods Five children of mixed aetiology in NCSE were given high flow of inhaled carbogen (5% carbon dioxide/95% oxygen) using a face mask for maximum 120s. EEG was recorded concurrently in all patients. The effects of inhaled carbogen on patient EEG recordings were investigated using band-power, functional connectivity and graph theory measures. Carbogen effect was quantified by measuring effect size (Cohen’s d) between “before”, “during” and “after” carbogen delivery states. Results Carbogen’s apparent effect on EEG band-power and network metrics across all patients for “before-during” and “before-after” inhalation comparisons was inconsistent across the five patients. Conclusion The changes in different measures suggest a potentially non-homogeneous effect of carbogen on the patients’ EEG. Different aetiology and duration of the inhalation may underlie these non-homogeneous effects. Tuning the carbogen parameters (such as ratio between CO 2 and O 2 , duration of inhalation) on a personalised basis may improve seizure suppression in future.