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Predicting outcome in hypoxic-ischemic coma. A prospective clinical and electrophysiologic study
T L Rothstein1, E M Thomas, S M Sumi
1Dept. of Medicine (Neurology), University of Washington, Seattle, WA.
Electroencephalography and Clinical Neurophysiology
|August 1, 1991
Summary
Brain-stem function preservation after cardiac arrest does not guarantee recovery. Electrophysiological tests like EEG and SEPs can help predict poor outcomes in hypoxic-ischemic coma patients.
Area of Science:
- Neurology
- Critical Care Medicine
- Neurophysiology
Background:
- Hypoxic-ischemic coma following sudden cardiac arrest presents a significant challenge in predicting patient outcomes.
- Preserved brain-stem function is often considered a positive prognostic sign, but its predictive value in this context requires further investigation.
Purpose of the Study:
- To evaluate the prognostic value of electroencephalography (EEG) and somatosensory evoked potentials (SEPs) in patients with hypoxic-ischemic coma after cardiac arrest.
- To determine if preserved brain-stem function reliably predicts favorable outcomes in these patients.
Main Methods:
- A prospective analysis of 40 patients with hypoxic-ischemic coma (≥6 hours) and preserved brain-stem function.
- Electrophysiological assessment using EEG and median nerve SEPs within 48 hours of cardiac arrest.
- Correlation of EEG and SEP findings with patient outcomes, including death, awakening, and degree of recovery.
Main Results:
- 65% of patients (26/40) died without awakening, indicating that preserved brain-stem function is not a reliable predictor of survival.
- Bilateral absence of cortical evoked potentials predicted death without awakening in 73% of non-awakened patients.
- Malignant EEG changes were also predictive of unfavorable outcomes, with combined EEG and SEP findings reliably predicting poor outcomes in 81% of cases.
- Prognosis remained uncertain for patients with normal/delayed central conduction time or benign/uncertain EEG findings, with some progressing to persistent vegetative state or death.
Conclusions:
- Preserved brain-stem function alone is insufficient to predict a favorable outcome in patients with hypoxic-ischemic coma post-cardiac arrest.
- EEG and SEP findings, particularly the bilateral absence of cortical evoked potentials and malignant EEG changes, are valuable tools for predicting unfavorable outcomes.
- Further research is needed to refine prognostic markers and distinguish between varying degrees of recovery in patients who do awaken.