Early Burst Suppression Similarity Association with Structural Brain Injury Severity on MRI After Cardiac Arrest

Area of Science:

• Neuroscience
• Critical Care Medicine
• Radiology

Background:

• Electroencephalography (EEG) burst suppression is a known predictor of poor outcomes post-cardiac arrest.
• The relationship between EEG burst similarity and structural brain injury severity on MRI remains uncharacterized.

Purpose of the Study:

• To investigate the association between EEG burst similarity and acute structural brain injury severity in comatose patients following cardiac arrest.
• To determine if burst similarity correlates with mean apparent diffusion coefficient (ADC) values on MRI.

Main Methods:

• Retrospective analysis of clinical, EEG, and MRI data from 113 cardiac arrest patients.
• Calculated burst similarity using dynamic time-warping (DTW) and cross-correlation on EEG data within 72 hours of return of spontaneous circulation.
• Assessed structural brain injury severity using whole-brain mean ADC values from MRI.

Main Results:

• Forty-five patients exhibited burst suppression, with three achieving good outcomes.
• DTW-measured burst similarity with varying burst lengths correlated significantly with mean ADC values in the first 36 hours post-cardiac arrest (Pearson's r ranging from -0.69 to -0.41).
• Burst similarity using equal burst lengths showed limited association with ADC values, except for DTW at 60-72 hours (r = -0.96).

Conclusions:

• EEG burst similarity may be linked to the severity of acute brain injury after cardiac arrest.
• The observed association is time-dependent when analyzed using DTW, highlighting its potential role in prognostication.