Is Electroencephalographic Burst-Suppression Good, Bad, or Indifferent for Brain Health? Context Matters

Area of Science:

• Neuroscience
• Anesthesiology
• Critical Care Medicine

Background:

• Intraoperative burst-suppression (BSP) is theorized to increase postoperative delirium (POD) risk.
• Existing meta-analyses and human studies suggest a link, but large randomized trials show inconsistent results.
• This discrepancy necessitates a deeper understanding of BSP's role in POD.

Purpose of the Study:

• To review the mechanisms of BSP generation in various clinical settings.
• To evaluate the role and utility of BSP in cerebral protection strategies.
• To discuss the significance of BSP concerning long-term neurological outcomes.

Main Methods:

• Narrative review of existing literature.
• Analysis of BSP generation mechanisms from anesthetics and neuronal pathologies.
• Examination of BSP's association with cerebral protection and neurological outcomes.

Main Results:

• BSP generation mechanisms vary across clinical contexts.
• The direct link between intraoperative BSP and POD risk is not consistently proven in large trials.
• BSP's utility in predicting POD and its impact on long-term outcomes require further investigation.

Conclusions:

• Discrepancies in BSP-POD association warrant explanation.
• The clinical utility of intraoperative electroencephalographic (EEG) monitoring for POD needs re-evaluation.
• A framework for understanding BSP across contexts is proposed to guide future research and clinical practice.