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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 l: Introduction

Seizures l: Introduction

Understanding seizures and epilepsy relies on key definitions that help in recognizing, classifying, and managing these disorders. These definitions provide a framework for recognizing, classifying, and managing seizure disorders.DefinitionsA seizure is a sudden, abnormal burst of electrical activity in the brain that can cause changes in awareness, movement, sensation, or behavior, depending on the area involved. Epilepsy is a chronic condition characterized by recurrent, unprovoked seizures,...

Epilepsy ll: Types

Epilepsy ll: Types

Recurrent seizures, stemming from abnormal electrical activity in the brain, are the defining characteristic of epilepsy, a chronic neurological condition. Because seizure features vary greatly, epilepsy is classified using two systems: by seizure type and by epilepsy syndromes. These classifications enable clinicians to describe seizure patterns and select suitable treatment strategies.I. Classification by Seizure Type1. Focal EpilepsyFocal epilepsy begins in one hemisphere of the brain.

Imaging Studies I: CT and MRI

Imaging Studies I: CT and MRI

Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
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Computed Tomography (CT) scan:
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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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Related Experiment Video

Updated: May 31, 2026

A Multimodal Imaging- and Stimulation-based Method of Evaluating Connectivity-related Brain Excitability in Patients with Epilepsy

A Multimodal Imaging- and Stimulation-based Method of Evaluating Connectivity-related Brain Excitability in Patients with Epilepsy

Published on: November 13, 2016

Epilepsy imaging study guideline criteria: commentary on diagnostic testing study guidelines and practice parameters.

William D Gaillard¹, J Helen Cross, John S Duncan

¹Center for Neuroscience, Children's National Medical Center, George Washington University, Washington, District of Columbia 20010, USA. wgaillar@cnmc.org

|July 12, 2011

Summary

Evaluating new medical technologies for epilepsy is challenging due to limited high-quality studies. This review addresses weaknesses in current evidence standards for advanced imaging and electrophysiology in epilepsy diagnostics and prognostics.

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Last Updated: May 31, 2026

A Multimodal Imaging- and Stimulation-based Method of Evaluating Connectivity-related Brain Excitability in Patients with Epilepsy

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Equipment Setup and Artifact Removal for Simultaneous Electroencephalogram and Functional Magnetic Resonance Imaging for Clinical Review in Epilepsy

Equipment Setup and Artifact Removal for Simultaneous Electroencephalogram and Functional Magnetic Resonance Imaging for Clinical Review in Epilepsy

Published on: June 23, 2023

Area of Science:

Medical Technology Assessment
Neuroscience
Clinical Evidence Synthesis

Background:

Limited economic resources and concerns about over-testing necessitate evidence-based evaluation of medical technologies.
Epilepsy diagnosis and treatment increasingly rely on advanced imaging and electrophysiology.
There is a significant lack of high-quality studies meeting rigorous evidence standards for epilepsy diagnostics and prognostics.

Purpose of the Study:

To review the limitations of current evidence classification guidelines for medical technologies in epilepsy.
To propose improvements for imaging studies to enhance the quality of evidence in epilepsy research.

Main Methods:

Literature review of existing evidence classification schemes and their applicability to epilepsy.
Analysis of fundamental weaknesses in current imaging studies for epilepsy.
Examination of practical challenges in conducting adequately powered studies for rapidly evolving technologies.

Main Results:

Current evidence classification schemes have limitations when applied to epilepsy research.
Fundamental weaknesses exist in many imaging studies for epilepsy.
Practical challenges hinder the execution of adequately powered studies for rapidly evolving technologies.

Conclusions:

There is a critical need to adapt evidence classification for epilepsy research, particularly for advanced imaging and electrophysiology.
Proposed elements for imaging studies aim to improve the quality and relevance of data in the epilepsy literature.
Addressing these limitations is crucial for accurate epilepsy diagnosis, prognosis, and treatment evaluation.