Pro-Con Debate: Electroencephalography-Guided Anesthesia for Reducing Postoperative Delirium.

Area of Science:

• Anesthesiology
• Neuroscience
• Geriatric Medicine

Background:

• Postoperative delirium (POD) significantly increases patient morbidity, mortality, and healthcare costs.
• Monitoring electroencephalography (EEG) during anesthesia is being explored as a method to reduce POD.
• The debate on EEG's utility in mitigating POD is crucial given the rising public health burden of delirium.

Purpose of the Study:

• To present a Pro-Con debate on the use of EEG monitoring to mitigate postoperative delirium.
• To critically evaluate the evidence supporting and refuting EEG-guided anesthesia for POD prevention.

Main Methods:

• This commentary reviews existing studies and meta-analyses on processed EEG (pEEG)-guided general anesthesia.
• It discusses the Electroencephalography Guidance of Anesthesia to Alleviate Geriatric Syndromes (ENGAGES) trial.
• Arguments for and against EEG use are presented, considering causality, optimal EEG signatures, and anesthetic depth risks.

Main Results:

• Proponents cite studies and meta-analyses showing reduced POD rates with pEEG-guided anesthesia.
• The ENGAGES trial is noted as an exception, with methodological concerns raised.
• Opponents question the causal link between anesthetic depth and POD, and the lack of defined EEG targets.

Conclusions:

• The evidence for EEG significantly reducing POD remains debated.
• Concerns exist regarding the interpretation of EEG data and the balance between anesthesia depth and potential risks.
• Anesthesia clinicians must weigh the potential benefits against the uncertainties of using EEG to prevent POD.