Book contents
- How to Read an EEG
- How to Read an EEG
- Copyright page
- Dedication
- Contents
- Figure Contributions
- Foreword
- Preface
- How to Read This Book
- Part I Basics
- Part II Interpretation
- Chapter 9 Approach to EEG Reading
- Chapter 10 Background
- Chapter 11 Foreground (How to Describe an Abnormality)
- Chapter 12 Common Artifacts
- Chapter 13 Normal Variants
- Chapter 14 Sporadic Abnormalities
- Chapter 15 Repetitive Abnormalities
- Chapter 16 Ictal Patterns (Electrographic Seizures)
- Chapter 17 Activation Procedures
- Part III Specific Conditions
- Appendix How to Write a Report
- Index
- References
Chapter 14 - Sporadic Abnormalities
from Part II - Interpretation
Published online by Cambridge University Press: 24 June 2021
Book contents
- How to Read an EEG
- How to Read an EEG
- Copyright page
- Dedication
- Contents
- Figure Contributions
- Foreword
- Preface
- How to Read This Book
- Part I Basics
- Part II Interpretation
- Chapter 9 Approach to EEG Reading
- Chapter 10 Background
- Chapter 11 Foreground (How to Describe an Abnormality)
- Chapter 12 Common Artifacts
- Chapter 13 Normal Variants
- Chapter 14 Sporadic Abnormalities
- Chapter 15 Repetitive Abnormalities
- Chapter 16 Ictal Patterns (Electrographic Seizures)
- Chapter 17 Activation Procedures
- Part III Specific Conditions
- Appendix How to Write a Report
- Index
- References
Summary
Sporadic abnormalities are those that occur in singles, pairs or in abundance but are not repetitive. They indicate cortical dysfunction, but the central question is if they are epileptogenic. They key electrographic feature to classify the waveform is its sharpness Spike and sharp waves pointed in morphology and are typically epileptogenic, these terms are often used interchangeably. Slow waves are blunted in morphology and are typically not epileptogenic (except rhythmic focal slowing).
- Type
- Chapter
- Information
- How to Read an EEG , pp. 119 - 133Publisher: Cambridge University PressPrint publication year: 2021
References
King, MA, Newton, MR, Jackson, GD, et al. Epileptology of the first-seizure presentation: a clinical, electroencephalographic, and magnetic resonance imaging study of 300 consecutive patients. The Lancet. 1998 Sep 26;352(9133):1007–11.CrossRefGoogle ScholarPubMed
Hirsch, LJ, LaRoche, SM, Gaspard, N, et al. American clinical neurophysiology society’s standardized critical care EEG terminology: 2012 version. Journal of Clinical Neurophysiology. 2013 Feb 1;30(1):1–27.Google Scholar
Sam, MC, So, EL. Significance of epileptiform discharges in patients without epilepsy in the community. Epilepsia. 2001 Oct 29;42(10):1273–8.CrossRefGoogle ScholarPubMed
Niedermeyer, E. Abnormal EEG patterns: epileptic and paroxysmal. In Electroencephalography: basic principles, clinical applications, and related fields (p. 255). Oxford University Press, Oxford; 2005.Google Scholar
Fois, A, Malandrini, F, Tomaccini, D. Clinical findings in children with occipital paroxysmal discharges. Epilepsia. 1988 Oct;29(5):620–3.CrossRefGoogle ScholarPubMed
Slatter, KH. Some clinical and EEG findings in patients with migraine. Brain. 1968 Mar 1;91(1):85–98.CrossRefGoogle ScholarPubMed
Kellaway, P, Bloxsom, A, MacGregor, M. Occipital spike foci associated with retrolental fibroplasia and other forms of retinal loss in children. Electroencephalography and Clinical Neurophysiology. 1955 Jan 1;7(3):469–70.Google Scholar
Pedley, TA. Interictal epileptiform discharges: discriminating characteristics and clinical correlations. American Journal of EEG Technology. 1980 Sep 1;20(3):101–19.CrossRefGoogle Scholar
Hedström, A, Olsson, I. Epidemiology of absence epilepsy: EEG findings and their predictive value. Pediatric Neurology. 1991 Mar 1;7(2):100–4.CrossRefGoogle ScholarPubMed
Seneviratne, U, Hepworth, G, Cook, M, D’Souza, W. Atypical EEG abnormalities in genetic generalized epilepsies. Clinical Neurophysiology. 2016 Jan 1;127(1):214–20.CrossRefGoogle ScholarPubMed
Ferlazzo, E, Nikaronova, M, Italiano, D, et al. Lennox–Gastaut syndrome in adulthood: clinical and EEG features. Epilepsy Research. 2010 May 1;89(2):271–7.CrossRefGoogle ScholarPubMed
Bazil, CW, Herman, ST, Pedley, TA. Focal electroencephalographic abnormalities. In Current practice of clinical electroencephalography (pp. 303–47). Lippincott Williams and Wilkins, New York; 2003.Google Scholar