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Epilepsy and Seizures: Overview

Epilepsy and Seizures: Overview

Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
Various factors can trigger epilepsy, including genetic factors, brain damage, metabolic causes, and unknown etiology. Diagnosis of epilepsy involves electroencephalography (EEG), which...

Seizures: Classification

Seizures: Classification

Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:

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Seizure duration estimates from single channel EEG record: a methodological report.

B N Gangadhar¹, N Janakiramaiah, D K Subbakrishna

¹B.N. Gangadhar, Department of Psychiatry, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore-560 029.

Indian Journal of Psychiatry

|July 22, 2011

Summary

This study demonstrates that a clear definition for seizure endpoint in electroencephalogram (EEG) recordings during electroconvulsive therapy (ECT) allows for reliable seizure duration estimation. High inter-rater reliability was achieved, improving accuracy in clinical practice.

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Area of Science:

Neuroscience
Psychiatry
Medical Technology

Background:

Accurate seizure duration measurement is crucial in electroconvulsive therapy (ECT).
Single-channel electroencephalogram (EEG) is commonly used to monitor ECT.
Establishing a reliable method for determining seizure endpoint is essential for consistent duration estimation.

Purpose of the Study:

To define and validate an operational definition for seizure endpoint in EEG recordings during ECT.
To assess the inter-rater reliability of identifying seizure endpoint among psychiatrists.
To determine the accuracy of seizure duration estimation using a single-channel EEG trace with the defined endpoint.

Main Methods:

Three independent psychiatrists reviewed 47 single-channel EEG records from ECT sessions.
Seizure endpoint was operationally defined as the point of the last spike.
Inter-rater reliability and modal differences in endpoint identification were calculated.

Main Results:

The operational definition of seizure endpoint allowed for reliable identification.
The inter-rater reliability coefficient among the three psychiatrists was 0.92, indicating high agreement.
The modal difference in seizure endpoint identification between any pair of raters or all three was 0.5 seconds or less.

Conclusions:

An operational definition for seizure endpoint significantly improves the reliability of identifying seizure duration from single-channel EEG during ECT.
This standardized method enhances the consistency and accuracy of ECT monitoring.
The findings support the use of this definition in clinical settings for more precise seizure duration assessment.