This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in

Aetiology

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Epilepsy is better defined as a symptom, rather than a disease which arises due to various conditions that involves the brain (1).

According to a UK National General Practice Study of Epilepsy, 60% of people with newly diagnosed or suspected epileptic seizures had epilepsy with no identifiable aetiology while in 15% and 6% vascular disease and tumour was the aetiology respectively (2).

When considering causes of seizures then they may be considered in terms of:

  • idiopathic (60% of cases)
  • the result of structural derangement of the brain
  • the result of infection
  • the result of metabolic derangement
  • the result of the action of or withdrawal from drugs

The ILAE has recommended the following three terms and their associated concepts for underlying type or cause (aetiology) of epilepsy instead of the terms idiopathic, symptomatic and cryptogenic (3).

  • Genetic:
    • concept of genetic epilepsy is that the epilepsy is, as best as understood, the direct result of a known or presumed genetic defect(s) in which seizures are the core symptom of the disorder
    • the knowledge regarding the genetic contributions may derive from specific molecular genetic studies that have been well replicated and even become the basis of diagnostic tests (e.g., SCN1A and Dravet syndrome) or the evidence for a central role of a genetic component may come from appropriately designed family studies. Designation of the fundamental nature of the disorder as genetic does not exclude the possibility that environmental factors (outside the individual) may contribute to the expression of disease. At the present time, there is virtually no knowledge to support specific environmental influences as causes of or contributors to these forms of epilepsy

  • Structural/metabolic:
    • conceptually, there is a distinct other structural or metabolic condition or disease that has been demonstrated to be associated with a substantially increased risk of developing epilepsy in appropriately designed studies. Structural lesions of course include acquired disorders such as stroke, trauma, and infection. They may also be of genetic origin (e.g., tuberous sclerosis, many malformations of cortical development); however, as we currently understand it, there is a separate disorder interposed between the genetic defect and the epilepsy

  • Unknown cause:
    • unknown is meant to be viewed neutrally and to designate that the nature of the underlying cause is as yet unknown; it may have a fundamental genetic defect at its core or it may be the consequence of a separate as yet unrecognized disorder

Reference:


Create an account to add page annotations

Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.

The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

Connect

Copyright 2024 Oxbridge Solutions Limited, a subsidiary of OmniaMed Communications Limited. All rights reserved. Any distribution or duplication of the information contained herein is strictly prohibited. Oxbridge Solutions receives funding from advertising but maintains editorial independence.