Bases neurophysiologiques et principes dinterprétation de l
L'analyse d'une trace EEG repose sur deux types de paramètres: la fréquence et l'amplitude du ou des rythmes dominants et la superposition à ceux-ci de grapho-.
Neurology
19 juil. 2010 That's all good but how the heck do I read an EEG!? • First know what you are looking at on the screen. • 1. Montages. • Electrodes.
Handbook of EEG Interpretation.pdf
For the successful interpretation of an abnormal EEG one must first understand the criteria necessary to define normal patterns. While a normal EEG does not
Electroencéphalographie dans les états de mal épileptiques
épileptiques : glossaire protocole et interprétation. Electroencephalography in status epilepticus: Glossary
Review - EEG interpretation: common problems
epileptic seizures and not based on interictal EEG. ? Video-EEG monitoring is the gold standard in defining the clinical diagnosis when it is necessary to
Electroencephalography Category List
00413 – Electroencephalogram – technical fee. 00415 – Electroencephalogram and interpretation. 00416 – Electroencephalogram interpretation neurologist.
Electroencephalography: basic biophysical and technological
interpret clinical EEG. This educa- tional review paper explains how. EEG signals are generated in the brain and how they are recorded /.
Pediatric EEG Abnormalities
EEG interpretation starts with an assessment of the EEG background which refers to the entire EEG. This starts with whether the background is continuous or
Reading Task Classification Using EEG and Eye-Tracking Data
12 déc. 2021 ZuCo is a dataset combining electroencephalography (EEG) and eye-tracking recordings from subjects reading natural English sentences.
Recommendations 02/2020 on the European Essential Guarantees
10 nov. 2020 guaranteed within the European Union within the meaning of Article ... of the third country surveillance measures against the EEG may lead.
[PDF] Handbook of EEG Interpretationpdf
This section will encompass patterns of cerebral and extracerebral origin as well as patterns of uncertain significance to illustrate the range of normal EEGs
[PDF] How To Interpret an EEG and its Report Neurology
19 août 2010 · First know what you are looking at on the screen • 1 Montages • Electrodes • Channels 8/19/2010 Template copyright 2005
[PDF] EEG interpretation: common problems - Open Access Journals
epileptic seizures and not based on interictal EEG ? Video-EEG monitoring is the gold standard in defining the clinical diagnosis when it is necessary to
[PDF] EEG Understanding interpretation and clinical implications
focus mainly on PSI in our ECT-suites • While interpreting the EEG during the course we do not observe the patient (seizure cough blinking) ECT and EEG
[PDF] LELECTRO-ENCEPHALOGRAMME EEG
La Stimulation Lumineuse Intermittente (SLI) délivre des éclairs lumineux intenses à une fréquence variant de 1 à 60 Hz selon les indications Les éclairs
[PDF] EEG manual for residents and fellows - Crossroads Academy
The clinical context should always be taken in consideration when interpreting an EEG Diffuse focal slowing and FIRDA can also be associated with epilepsy but
Handbook of EEG Interpretation [3rd Edition] 9780826147080
of the most trusted resource for anyone involved in EEG interpretation quick and easy “pattern recognition” has been our format though by the end
[PDF] ELECTROENCEPHALOGRAPHY
An Introductory Text and Atlas of Normal and Abnormal Findings in Adults An Orderly Approach to EEG Analysis: Visual Inspection of the Background and
Interpreting Electroencephalogram (EEG) – An Introductory Review
19 mai 2020 · PDF This work aims to compile various measurement and calibration techniques for Electroencephalogram (EEG) The objective is to provide
[PDF] Electroencéphalographie dans les états de mal épileptiques
épileptiques : glossaire protocole et interprétation Electroencephalography in status epilepticus: Glossary protocol and interpretation P Gelissea?
How do I interpret my EEG results?
If the electrical activity at the active electrodes is positive when compared to the activity at the reference electrode, the deflection will be downward. Electrodes where the electrical activity is the same as at the reference electrode will not show any deflection.What are normal EEG readings?
Most waves of 8 Hz and higher frequencies are normal findings in the EEG of an awake adult. Waves with a frequency of 7 Hz or less often are classified as abnormal in awake adults, although they normally can be seen in children or in adults who are asleep.What is an EEG PDF?
The electroencephalogram (EEG) is a widely used non-invasive method for monitoring the brain. It is based upon placing metal electrodes on the scalp which measure the small electrical potentials that arise outside of the head due to neuronal action within the brain.Doctors use information from an EEG to gain insight into brain activity.
1Alpha waves are related to relaxation and attention. They are present when you are awake with your eyes closed. 2Beta waves are normal in people who are awake. 3Theta waves are related to sleep. 4Delta waves are also related to sleep.
How To Interpret an EEGHow
ToInterpret
an EEG and its Re p ort pMarie Atkinson, MD
Assistant Professor of Neurology
WSU School of Medicine/DMCWSU
School
ofMedicine/DMC
Comprehensive Epilepsy Program
July 19, 2010
What is an EEG?What
is an EEG?An EEG is a scalp recording of brain
An EEG is a scalp recording of brain wave activity. • The brain wave activity recorded is a summation of the inhibitor y and y excitatory post synaptic potentials that occur across a neuron membraneoccur across a neuron membrane8/19/2010 Template copyright 2005 www.brainybetty.com 2
That's all good but how the heck do I
read an EEG!? • First know what you are looking at on the screen. • 1. Montages • Electrodes • Channels8/19/2010 Template copyright 2005 www.brainybetty.com 3
B Montage
A Montage
aka Bi p olar Monta g e pg aka referential montage -Different Montages allow you to see different things8/19/2010 Template copyright 2005 www.brainybetty.com 4
things8/19/2010 Template copyright 2005 www.brainybetty.com 5
Bipolar Montage
8/19/2010 Template copyright 2005 www.brainybetty.com 6
A Montage
Z-P Montage
8/19/2010 Template copyright 2005 www.brainybetty.com 7
Z-T Monta
g e gZ-C Montage
8/19/2010 Template copyright 2005 www.brainybetty.com 8
2. Sensitivity
8/19/2010 Template copyright 2005 www.brainybetty.com 10
7.5 microvolts
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2.0 microvolts
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30.0 microvolts
SensitivitySensitivity
The gist whatever voltage you decideThe
gist whatever voltage you decide to read at will see waveforms at that voltage or highervoltage or higher • The lower the voltage the more you will seesee • Read at the voltage that allows you to see the waveforms the best •Usuall y at 7.5 microvolts8/19/2010 Template copyright 2005 www.brainybetty.com 13
y 3Filters
3Filters
8/19/2010 Template copyright 2005 www.brainybetty.com 15
LF (Low Frequency) FilterLF
(LowFrequency)
Filter
The gist... whatever number you set it up at,The
gist... whatever number you set it up at, the EEG will not amplify any frequencies b elow that number.Ex. LF filter set at 1.0Hz will not show onEx.
LF filter set at 1.0Hz will not show onEEG any waves with a frequency below
1.0Hz.
Usually LF filter is set at
1.0Hz8/19/2010 Template copyright 2005 www.brainybetty.com 16
Usually
LF filter is set at 1.0HzHF (High Frequency) FilterHF
(HighFrequency)
Filter
Just the opposite of LF filter EEG will
Just the opposite of LF filter EEG will not display any frequencies above this di td bd es i gna t e d num b er. • Usually set at 35Hz8/19/2010 Template copyright 2005 www.brainybetty.com 17
Notch (60Hz) FilterNotch
(60Hz)Filter
Special filter that sharply cuts off any
Special
filter that sharply cuts off any activity at 60Hz and above.Current through plugs often is at 60Hz,Current
through plugs often is at 60Hz,allows you to get rid of outside artifact by other machinery in roomother machinery in room
8/19/2010 Template copyright 2005 www.brainybetty.com 18
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Enough of the technical, can we please
learn how to read the EEG!Break it down into steps:Break
it down into steps: 1 kdAii ill 1 .Bac kg roun d A ct i v i t y gi ves y ou an overa ll sense of what is going on with the patient.2. Symmetry- is there any focal changes seen.
3. Sta
g e of alertness g4. Abnormality - slowing, sharp waves,
triphasics seizure PLEDs etc8/19/2010 Template copyright 2005 www.brainybetty.com 20
triphasics seizure PLEDs etcBackgroundBackground
Gives you a sense of how the patient isGives
you a sense of how the patient is doingBest evaluated in posterior channel usually
Best evaluated in posterior channel usually occipitalPi h h l d
P at i ent h as to h ave e y es c l ose d - 4 different frequencies: delta, theta, alpha, and beta8/19/2010 Template copyright 2005 www.brainybetty.com 21
8/19/2010 Template copyright 2005 www.brainybetty.com 22
Background FrequenciesBackground
Frequencies
Delta (marked slowing)Delta
(marked slowing) -1-3HzTh t ( ildl l )
Th e t a m ildly s l ow -4-7Hz • Alpha (normal back g round) - 8-13Hz • Beta (barbituates/benzos) >13Hz8/19/2010 Template copyright 2005 www.brainybetty.com 23
Delta FrequencyDelta
Frequency
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Theta FrequencyTheta
Frequency
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Beta FrequencyBeta
Frequency
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Normal EEGNormal
EEGNormal background activity (alpha
Normal
background activity (alpha frequency) • No abnormalities (nothing stands out in the back g round g) • No changes in the EEG provoked by photic hyperventilationphotic hyperventilation • No assymmetry8/19/2010 Template copyright 2005 www.brainybetty.com 27
8/19/2010 Template copyright 2005 www.brainybetty.com 28
Asymmetries
Asymmetric SlowingAsymmetric
Slowing
Seen with focal lesions surgery etc
Seen with focal lesions surgery etc • Easy to see with A montage • Can be unmasked with hyperventilation or photic stimulationor photic stimulation8/19/2010 Template copyright 2005 www.brainybetty.com 30
Right Hemisphere SlowingRight
Hemisphere
Slowing
8/19/2010 Template copyright 2005 www.brainybetty.com 31
PLEDsPLEDs•
Stands for
Periodic Lateralized Epileptiform
Stands
forPeriodic
Lateralized
Epileptiform
Discharges"
Occurs throughout the entire EEG at aOccurs
throughout the entire EEG at a frequency of 1-2HzOnly in one hemisphereOnly
in one hemisphere • Seen usually in acute lesions (stroke, bleed, etc), postictal, Herpes Encephalites, CJD, etcetc), postictal,Herpes
Encephalites,
CJD, etc • Controversy over what they mean, nonconvulsive status or not?8/19/2010 Template copyright 2005 www.brainybetty.com 32
nonconvulsive status or not?quotesdbs_dbs35.pdfusesText_40[PDF] comment lire un eeg
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