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Intraoperative Frontal Electroencephalogram Alpha Power Is Associated with Postoperative Mortality and Other Adverse
Rory Vu Mather1, Ryan Nipp2, Gustavo Balanza3
1Harvard/MIT MD-PhD Program, Boston, Massachusetts; Harvard-MIT Program in Health Sciences and Technology, Cambridge, Massachusetts; Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, Boston, Massachusetts; Department of Anesthesia, Perioperative and Pain Medicine, Stanford University School of Medicine, Palo Alto, California.
Intraoperative electroencephalogram (EEG) alpha power predicts postoperative mortality. This finding offers a low-burden, personalized risk assessment tool for clinicians, improving patient outcomes and reducing surgical deaths.
Area of Science:
- Anesthesiology
- Neuroscience
- Critical Care Medicine
Background:
- Millions of deaths occur annually due to postoperative mortality, highlighting the need for better risk assessment.
- Current methods for predicting perioperative risk are often inaccurate, burdensome, or lack intraoperative data.
- Previous research indicated a link between anesthetic-induced alpha band oscillations in the prefrontal electroencephalogram (EEG) and postoperative cognitive function.
Purpose of the Study:
- To investigate the association between intraoperative EEG alpha power and postoperative mortality.
- To evaluate EEG alpha power as a potential predictor of various adverse postoperative outcomes.
- To explore the utility of EEG alpha power as a low-burden, personalized perioperative risk measure.
Main Methods:
- Retrospective analysis of 1,081 patients undergoing general anesthesia with intraoperative EEG monitoring.
- Statistical modeling on propensity-weighted data to assess the relationship between EEG alpha power and adverse outcomes.
- Primary outcome: postoperative mortality; Secondary outcomes: mortality at various time points, length of stay, discharge disposition, and readmission.
Main Results:
- Increased intraoperative EEG alpha power was significantly associated with reduced overall mortality risk (HR, 0.92; P=0.039).
- Alpha power correlated with lower mortality at 30 days (OR, 0.81), 90 days (OR, 0.68), 180 days (OR, 0.75), and 1 year (OR, 0.85).
- EEG alpha power also predicted lower likelihood of discharge to long-term care (OR, 0.91), but not readmission or extended hospital stays.
Conclusions:
- Intraoperative EEG alpha power is an independent predictor of postoperative mortality and adverse outcomes.
- This measure may reflect a patient's overall postoperative physical resilience.
- EEG alpha power offers a promising, low-burden tool for personalized perioperative risk assessment.
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