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Vol. 59, No. 5, 2008
Issue release date: April 2008
Section title: Original Paper
Eur Neurol 2008;59:267–271
(DOI:10.1159/000115641)

Errors in EEG Interpretation and Misdiagnosis of Epilepsy

Which EEG Patterns Are Overread?

Benbadis S.R. · Lin K.
aComprehensive Epilepsy Program, Departments of Neurology and Neurosurgery, University of South Florida and Tampa General Hospital, and bUniversity of South Florida, Tampa, Fla., USA

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 7/11/2007
Accepted: 9/18/2007
Published online: 2/8/2008

Number of Print Pages: 5
Number of Figures: 1
Number of Tables: 0

ISSN: 0014-3022 (Print)
eISSN: 1421-9913 (Online)

For additional information: http://www.karger.com/ENE

Abstract

Background/Aims: The overinterpretation of EEGs is common and is an important contributor to the misdiagnosis of epilepsy. We reviewed our experience in order to clarify which EEG patterns are commonly overread as epileptiform. Methods: We identified patients who were seen at our epilepsy clinic and were ultimately diagnosed as having conditions other than epilepsy. We selected those who had previously had an EEG read as showing epileptiform discharges and whose EEG was available for our own re-review. Results: 37 patients met the above criteria. Eventual diagnoses were psychogenic nonepileptic seizures (10), syncope (7), other miscellaneous diagnoses (5) and unexplained nonspecific symptoms (15). None of the EEGs had epileptiform discharges. The descriptions of the abnormalities included ‘temporal sharp waves’ in 30, ‘frontal sharp waves’ in 2 and ‘generalized spike-wave complexes’ in 2. Three had no reports available to identify the alleged abnormality. The benign patterns mistaken for temporal (30) and frontal (2) sharp waves were simple fluctuations of background activity with temporal phase reversals. Conclusions: By far the most common patterns overread as epileptiform are nonspecific fluctuations of background in the temporal regions, which are misread as temporal sharp waves.


  

Author Contacts

Selim R. Benbadis, MD
4, Columbia Drive, Suite 730
Tampa, FL 33606 (USA)
Tel. +1 813 259 0892, Fax +1 813 259 0858
E-Mail sbenbadi@health.usf.edu

  

Article Information

Received: July 11, 2007
Accepted: September 18, 2007
Published online: February 8, 2008
Number of Print Pages : 5
Number of Figures : 1, Number of Tables : 0, Number of References : 50

  

Publication Details

European Neurology

Vol. 59, No. 5, Year 2008 (Cover Date: April 2008)

Journal Editor: Bogousslavsky, J. (Montreux)
ISSN: 0014–3022 (Print), eISSN: 1421–9913 (Online)

For additional information: http://www.karger.com/ENE


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 7/11/2007
Accepted: 9/18/2007
Published online: 2/8/2008

Number of Print Pages: 5
Number of Figures: 1
Number of Tables: 0

ISSN: 0014-3022 (Print)
eISSN: 1421-9913 (Online)

For additional information: http://www.karger.com/ENE


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