Elsevier

Resuscitation

Volume 165, August 2021, Pages 170-176
Resuscitation

Clinical paper
Early recovery of frontal EEG slow wave activity during propofol sedation predicts outcome after cardiac arrest

https://doi.org/10.1016/j.resuscitation.2021.05.032Get rights and content
Under a Creative Commons license
open access

Abstract

Aim of the study

EEG slow wave activity (SWA) has shown prognostic potential in post-resuscitation care. In this prospective study, we investigated the accuracy of continuously measured early SWA for prediction of the outcome in comatose cardiac arrest (CA) survivors.

Methods

We recorded EEG with a disposable self-adhesive frontal electrode and wireless device continuously starting from ICU admission until 48 h from return of spontaneous circulation (ROSC) in comatose CA survivors sedated with propofol. We determined SWA by offline calculation of C-Trend® Index describing SWA as a score ranging from 0 to 100. The functional outcome was defined based on Cerebral Performance Category (CPC) at 6 months after the CA to either good (CPC 1–2) or poor (CPC 3–5).

Results

Outcome at six months was good in 67 of the 93 patients. During the first 12 h after ROSC, the median C-Trend Index value was 38.8 (interquartile range 28.0–56.1) in patients with good outcome and 6.49 (3.01–18.2) in those with poor outcome showing significant difference (p < 0.001) at every hour between the groups. The index values of the first 12 h predicted poor outcome with an area under curve of 0.86 (95% CI 0.61−0.99). With a cutoff value of 20, the sensitivity was 83.3% (69.6%–92.3%) and specificity 94.7% (83.4%–99.7%) for categorization of outcome.

Conclusion

EEG SWA measured with C-Trend Index during propofol sedation offers a promising practical approach for early bedside evaluation of recovery of brain function and prediction of outcome after CA.

Keywords

Cardiac arrest
EEG
Hypoxic-Ischemic encephalopathy
Outcome
Prognostication
Propofol

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