Abstract:
BACKGROUND:The time between anaesthetic induction and ECT stimulus administration has been hypothesised to significantly impact ictal EEG quality. In this study, our aim was to examine the effect of the time interval between anaesthetic induction and the ECT stimulus for ictal seizure quality in ECT sessions utilising thiopentone anaesthesia. METHODS:413 EEG traces from 42 patients, collected retrospectively, were manually rated using a quantitative-qualitative structured rating scale (indices including seizure amplitude, regularity, post-ictal suppression and general seizure quality). Linear Mixed Effects Models were used to analyse the effect of the anaesthetic-ECT time interval on seizure quality indices, seizure duration and orientation scores after ECT, controlling for patient and ECT treatment factors. RESULTS:The anaesthetic-ECT time interval had a significant impact on ictal EEG quality indices (p < 0.05), with longer times producing higher quality seizures. Seizure duration and orientation scores after ECT were not significantly influenced by the anaesthetic-ECT time interval. Age, anaesthetic dose, ECT type and ECT treatment number also had a significant impact on measures of seizure quality (p < 0.05). LIMITATIONS:The effect of ventilation technique was not explicitly measured. Only manual ratings of ictal quality were analysed. CONCLUSIONS:The time between anaesthetic induction and ECT stimulus administration has a significant impact on the ictal EEG seizure quality observed, with thiopentone anaesthetic. These results are consistent with prior findings with propofol anaesthesia, and suggest a need for routine clinical monitoring of this time interval. This variable warrants consideration when interpreting ictal EEGs, which often informs subsequent dosing decisions.
journal_name
J Affect Disordjournal_title
Journal of affective disordersauthors
Taylor R,Hadzi-Pavlovic D,Nikolin S,Bull M,Wark H,Leyden J,Harper S,Martin D,Galvez V,Loo Cdoi
10.1016/j.jad.2019.04.027subject
Has Abstractpub_date
2019-06-01 00:00:00pages
135-140eissn
0165-0327issn
1573-2517pii
S0165-0327(18)33140-9journal_volume
252pub_type
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