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Etiology, neurologic correlations, and prognosis in alpha coma
1Johns Hopkins Bayview Medical Center, Johns Hopkins University School of Medicine, Baltimore, MD 21224, USA.
Summary
Alpha coma (AC) prognosis is poor, with most patients dying. EEG reactivity to stimuli is a key predictor of survival, though meaningful recovery is rare, especially after cardiorespiratory arrest.
Area of Science:
- Neurology
- Critical Care Medicine
- Neurophysiology
Background:
- Alpha coma (AC) is a rare electroencephalogram (EEG) pattern observed in comatose patients.
- Determining prognostic factors in AC is crucial for clinical decision-making and patient management.
Purpose of the Study:
- To identify factors influencing the prognosis of patients with alpha coma (AC).
- To evaluate the predictive value of EEG reactivity for outcomes in AC.
Main Methods:
- Retrospective review of 36 AC patients and 36 matched control coma patients.
- Meta-analysis of 335 cases from the world literature on alpha coma.
Main Results:
- Cardiorespiratory arrest (CRA) was a primary cause of AC. Overall mortality for AC was 76%.
- EEG reactivity to noxious stimuli was a strong predictor of outcome: patients with reactive EEGs had a better chance of waking.
- Prognosis varied significantly by etiology; drug-induced AC had an 8% mortality, while AC post-CRA had an 88% mortality.
Conclusions:
- While the etiology of AC is a major determinant of outcome, EEG reactivity is a critical independent predictor of survival.
- Most patients with reactive EEGs survived, whereas most without reactivity died.
- Meaningful recovery was uncommon among survivors of alpha coma.