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Clinical EEG findings in mania
J G Small1, V Milstein, C E Medlock
1Department of Psychiatry, Indiana University School of Medicine, Larue D. Carter Memorial Hospital, Indianapolis 46222-2202, USA.
Clinical EEG (Electroencephalography)
|October 31, 1997
Summary
Electroencephalogram (EEG) studies in manic patients revealed that most had normal findings or mild variations. However, 16% showed definitive abnormalities, with some linked to family history and left-sided brain activity.
Area of Science:
- Neuroscience
- Psychiatry
- Clinical Electrophysiology
Background:
- Electroencephalography (EEG) is a key tool in psychiatric research.
- Understanding EEG patterns in bipolar disorder is crucial for diagnosis and treatment.
- Previous studies have explored EEG abnormalities in mania, but findings require further clarification.
Purpose of the Study:
- To describe clinical EEG findings in a large cohort of hospitalized manic patients.
- To investigate relationships between EEG abnormalities, family history, and illness course.
- To evaluate the utility of EEG in differentiating affective disorders and monitoring medication effects.
Main Methods:
- EEG recordings were analyzed from 202 hospitalized patients with mania, including 131 recurrences.
- Findings were correlated with family history, medication use, and longitudinal illness data.
- Incidence of specific EEG abnormalities, including microsleep and spike-wave discharges, was quantified.
Main Results:
- Most patients (majority) exhibited normal EEGs or mild, non-specific deviations, often related to medication.
- Definitive EEG abnormalities were present in 16% of patients.
- Significant associations were found between moderate/severe EEG abnormalities and negative family history.
- Lateralized abnormalities occurred in 9%, predominantly on the left.
- Microsleep (19%) and small sharp spikes (17%) were noted in drowsy patients.
Conclusions:
- Clinical EEG studies are valuable for distinguishing primary from secondary affective disorders.
- EEG is sensitive to the effects of lithium and other psychotropic medications.
- The clinical significance of EEG variations, including microsleep, requires further investigation.
- Heritability, hemispheric dysfunction, and the longitudinal course of mania warrant continued research.