Electroencephalogram

Aka: Electroencephalogram, EEG

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II. Background

  1. Measures electrical activity of cerebral cortex via sampled electrodes placed over the surface of the scalp
  2. Measures gray matter function (Neuronal function)
  3. Normal in white matter disease

III. Findings: Brain Wave Types

  1. Beta Waves
    1. Frequency >13 Hz
    2. Fine, medium amplitude wave form
    3. Seen in an alert patient
  2. Alpha Waves
    1. Frequency 8-13 Hz
    2. Seen in a quiet but awake patient or during REM Sleep
    3. Low amplitude wave form
  3. Theta Waves
    1. Frequency 4-7 Hz
    2. Seen in drowsy patients
  4. Delta Waves
    1. Frequency <4 Hz
    2. Seen in deep, non-REM Sleep patient

IV. Findings: Pathologic Brain Waves

  1. Flat Line
    1. Seen in brain death, as well as some Medication Overdoses
  2. Diffuse Slowing
    1. Organic brain syndrome or post-ictal state
  3. Localized Slowing
    1. Focal neurologic lesion

V. Findings: Seizure Disorder findings

  1. Indications
    1. Seizure Diagnosis
    2. Anticonvulsant weaning
      1. Seizure free for 2 years and
      2. Normal EEG
  2. Non-Seizure Times
    1. Abnormal in 70% of Seizure patients
  3. During Generalized Tonic Clonic Seizure
    1. Massive electrical discharge with high frequency, high amplitude waves
  4. During Focal Seizure
    1. Localized Seizure activity
  5. During Petit Mal Seizure
    1. Spike and Dome wave pattern
  6. Post-ictal
    1. Slowing of EEG
  7. Medications that do not affect EEG
    1. Anticonvulsants
  8. Medications that cause Beta (fast wave patterns)
    1. Barbiturates
    2. Benzodiazepines

VI. Findings: Cerebrovascular Accident (CVA) assessment

  1. Cortical CVA (large vessel disease)
    1. Abnormal EEG
  2. Subcortical or Brainstem CVA (small vessels disease)
    1. Normal EEG

VII. Findings: Metabolic encephalopathy

  1. Non-focal slowing of EEG
  2. Rhythmic bursts of symmetrical frontal slowing
  3. Specific patterns may assist with etiology
    1. Hepatic Encephalopathy: Triphasic waves

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Related Studies

Ontology: Electroencephalography (C0013819)

Definition (NCI) The neurophysiologic exploration of the electrical activity of the brain by the application of electrodes to the scalp. The resulting traces are known as an electroencephalogram (EEG). This test is used to assess brain damage, epilepsy and other problems.
Definition (NCI_CDISC) A technique used to capture and record spontaneous electrical activity of the brain by the application of electrodes to the scalp.
Definition (NCI_NCI-GLOSS) A recording of electrical activity in the brain. It is made by placing electrodes on the scalp (the skin covering the top of the head), and impulses are sent to a special machine. An EEG may be used to diagnose brain and sleep disorders.
Definition (MSH) Recording of electric currents developed in the brain by means of electrodes applied to the scalp, to the surface of the brain, or placed within the substance of the brain.
Definition (PSY) Method of graphically recording the electrical activity (potentials) of the brain by means of intracranial electrodes or electrodes applied to the scalp. Used both for the method as well as the resulting electroencephalogram or the electrophysiological activity itself.
Definition (CSP) recording of electric currents developed in the brain, by means of electrodes applied to the scalp or the brain.
Concepts Diagnostic Procedure (T060)
MSH D004569
ICD9 89.14
ICD10 11000-00 , 1825
SnomedCT 146484006, 141895008, 367215000, 54550000
CPT 1013322
LNC LP6239-0
English EEG, electroencephalography, Electroencephalogram (EEG), ELECTROENCEPHALOGR, Electroencephalography [EEG], eeg electroencephalography, electroencephalograms, electroencephalography (EEG), Electroencephalography (procedure), ELECTROENCEPHALOGRAPHY, electroencephalogram, Electroencephalogram, EEG - Electroencephalography, Electroencephalogram (procedure), Electroencephalogram, NOS, EEG, NOS, EEG (Electrophysiology), Electroencephalography, Electrical tracings;neurolo, electroencephalogram (EEG)
Italian Elettroencefalogramma, EEG, Elettroencefalografia
French EEG, Électro-encéphalographie, EEG (ÉlectroEncéphaloGraphie), Electro-encéphalogramme, Électroencéphalographie
Japanese ＥＥＧ, EEG, ﾉｳﾊ, 脳波, 脳波検査, 脳波検査法, 脳波記録, 脳波記録法
Swedish Elektroencefalografi
Czech elektroencefalografie, Elektroencefalogram, EEG
Finnish Elektroenkefalografia
Russian ELEKTROENTSEFALOGRAFIIA, EEG, ЭЛЕКТРОЭНЦЕФАЛОГРАФИЯ, ЭЭГ
Croatian ELEKTROENCEFALOGRAFIJA
Polish Elektroencefalografia
Hungarian Elektroenkefalogram, EEG
Norwegian Elektroencefalografi, EEG, Elektroencephalografi
Portuguese Eletroencefalograma, Encefalografia, EEG, Eletroencefalografia
Spanish electroencefalograma (procedimiento), electroencefalograma, Electroencefalograma, EEG, Electroencefalografía
Dutch elektro-encefalogram, EEG, Elektro-encefalografie
German EEG, Elektroenzephalographie
Derived from the NIH UMLS (Unified Medical Language System)

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