Definitions
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| EEG frequency band of 8-13 Hz | show 🗑
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| EEG pattern characterized by alpha frequency activity whic is monotonous and widespread and shows no response to stimulation in a comatose pt | show 🗑
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| EEG pattern characterized by alpha frequency and theta frequency activity which i s monotonous and widespread and shows no response to stimulation in a comatose pt | show 🗑
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| show | alpha rhythm
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| the voltage of the EEG waveform or waveform complex measure din mircrovolts | show 🗑
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| show | artifact
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| EEG activity that is decreased or increased in one hemisphere when compared to the same region in the opposite hemisphere | show 🗑
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| independent or non-simultaneous occurrence in time of EEG waveforms over the two hemispheres | show 🗑
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| reduction of the amplitude of EEG activity resulting from decreased voltage; may be seen on the EEG of a comatose patient during painful stimulation | show 🗑
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| show | background activity
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| frequency of the activity seen in the occipital electrodes when the patient is alert | show 🗑
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| show | beta
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| show | bilateral
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| show | BiPDs - bilateral periodic discharges
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| represents the difference between two EEG scalp electrodes in each channel | show 🗑
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| EEG waveforms occurring bilaterally at the same time | show 🗑
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| higher amplitude EEG waveforms seen over a skull defect | show 🗑
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| show | burst
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| and EEG pattern characterized by bursts of theta and / or delta often intermixed with faster frequencies with intervening periods of relative quiescence or flattening. | show 🗑
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| show | cEEG (continuous EEG)
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| arising from the area of the brain around the central sulcus | show 🗑
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| show | complex
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| a focal seizure associated with diminished consciousness or responsiveness | show 🗑
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| any values/interpretations where delays in reporting may result in serious adverse outcomes for patients; also known as: critical values | show 🗑
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| show | critical values
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| EEG frequency band of less than 4 hertz | show 🗑
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| EEG activity that is widespread and occurring over large areas of the head | show 🗑
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| show | diffuse slowing
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| show | dominant frequency
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| no EEG activity over 2 microvolts when recorded from scalp electrode pairs 10 or more centimeters apart with electrode impedances under 10,000 Ohms. | show 🗑
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| no EEG activity over 2 microvolts when recorded from scalp electrode pairs 10 or more centimeters apart with electrode impedances under 10,000 Ohms | show 🗑
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| a measure of the how well the EEG electrode has been applied. High impedances can help to identify problem electrodes. Generally EEG electrode impedances are under 5,000 Ohms. | show 🗑
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| show | electrographic seizure
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| distinctive EEG waves or complexes, distinguished from the BG activity, and resembling those recorded in a proportion of human subjects suffering from epileptic disorders, rendered epileptic experimentally. Epileptiform is the preferred term. | show 🗑
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| show | epileptiform discharges
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| show | epileptic spikes
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| show | epileptiform activity
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| any EEG activity that is faster than 13 hertz – beta (13 to 30 Hz) and gamma (30 Hz and above | show 🗑
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| intermittent, rhythmic trains of delta activity in the frontal regions; is a non-specific finding in adult patients | show 🗑
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| show | focal
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| how often a changing signal repeats itself. The unit is hertz (Hz) or cycles per second (cps).` | show 🗑
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| EEG activity that is coming from these electrodes (Fp1, Fp2, F3, F4, F7, F8) | show 🗑
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| EEG activity that has its highest amplitude in the frontal electrodes. For example: frontally dominant spike and wave activity, frontally dominant delt | show 🗑
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| show | gamma
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| EEG waveforms occurring simultaneously in all recording electrodes | show 🗑
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| EEG waveforms in the theta and/or delta frequency ranges occurring simultaneously in all recording electrodes | show 🗑
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| spike and wave EEG waveforms occurring simultaneously in all recording electrodes | show 🗑
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| show | glossokinetic
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| EEG pattern characterized by generalized and synchronous discharges usually with a relative paucity of intervening background activity. This pattern usually reflects a severe, diffuse cerebral insult as in seen with anoxia. | show 🗑
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| show | hertz
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| show | high amplitude
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| show | high voltage
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| having the same relative position or structure. For example: C3 and C4 are homologous electrodes. | show 🗑
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| show | ictal
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| show | interictal
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| show | impedance
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| EEG waves or complexes that occur between seizures and are distinguished from the background activity, and resembling those recorded in a proportion of human subjects suffering from epileptic disorders and in animals rendered epileptic experimentally. | show 🗑
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| show | irregular
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| a normal component of sleep; sharply contoured, high amplitude EEG waveforms followed by a slower component occurring spontaneously and with stimulation. | show 🗑
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| occurring only over one hemisphere | show 🗑
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| show | low amplitude
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| a non-specific term indicating that the voltage seen on the EEG is lower than expected; usually less than 20 microvolts | show 🗑
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| a non-specific term indicating the frequencies on the EEG are slightly slower than expected | show 🗑
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| show | mixed frequency activity
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| show | montage
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| show | mu
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| two or more independent foci are present in the EEG recording electrodes | show 🗑
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| waveforms characteristic of a seizure are seen on the EEG recording and are not associated with any demonstrable clinical changes in the patient; also known as: electrographic seizure, subclinical seizure | show 🗑
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| show | NCSE - non convulsive status epilepticus
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| show | neurotelemetry
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| show | paroxysmal
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| theta and delta frequency waveforms with abrupt onset, rapid attainment of maximum amplitude, and sudden termination that are easily distinguished from the background | show 🗑
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| spike and wave complexes with abrupt onset, rapid attainment of maximum amplitude, and sudden termination that are easily distinguished from the background | show 🗑
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| show | PEDs - periodic epileptiform discharges
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| EEG waveform or complex of waves that appears at a consistent rate, for example: one every 1 to 4 seconds | show 🗑
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| EEG patterns that appear at a consistent rate, for example: generalized periodic epileptiform discharges (GPEDs), periodic lateralized epileptiform discharges (PLEDs) | show 🗑
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| high amplitude, generalized, irregular spike and wave or multiple spike and wave bursts seen during photic stimulation | show 🗑
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| EEG pattern characterized by sharp waves or spikes occurring at a regular rate; most often seen in acute neurologic conditions, especially cerebral infarctions | show 🗑
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| show | polymorphic
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| show | polyspikes
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| show | post ictal
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| a normal component of sleep seen predominantly in the occipital regions | show 🗑
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| show | PDR - posterior dominant rhythm
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| a distinctive EEG pattern characterized by marked attenuation of all frequencies including delta activity in the ischemic hemisphere | show 🗑
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| change in the EEG activity following stimulation | show 🗑
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| compares the EEG scalp electrode with a reference point somewhere else on the body, perhaps still on the scalp, which is hoped will be neutral or indifferent | show 🗑
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| show | rhythmic
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| generalized discharges arising from a unilateral cortical focus | show 🗑
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| a clinically bilateral tonic-clonic seizure that on EEG starts in a focal area and quickly spreads to all EEG recording electrodes | show 🗑
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| waves or complexes, distinguished from the background activity, and resembling those recorded in a proportion of human subjects suffering from epileptic disorders and in animals rendered epileptic experimentally. Epileptiform is the preferred term. | show 🗑
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| EEG waveforms with a duration of greater than 70 milliseconds but less than 200 milliseconds. Another term for sharp wave. | show 🗑
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| an EEG waveform with a duration of greater than 70 milliseconds but less than 200 milliseconds | show 🗑
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| show | sharp wave complex
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| a localized seizure (isolated to a small area of the brain) with no changes in cognition | show 🗑
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| show | sleep spindles
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| EEG waves that are below 8 hertz – theta (4 to 8 Hz) and delta (less than 4 Hz) | show 🗑
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| show | slowing
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| show | spike
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| EEG waveform consisting of a spike followed by a slow wave. Can be focal, lateralized, or generalized. Sometimes called | show 🗑
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| show | spike and wave discharge
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| show | spindle coma
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| show | subclinical
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| attenuation of EEG waveforms. Can be focal, lateralized, or generalized. | show 🗑
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| show | suppression burs or burst suppression
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| EEG waveforms that are equal in frequency and amplitude over homologous (corresponding) regions of the head | show 🗑
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| simultaneous occurrence in time of EEG waveforms over homologous head regions | show 🗑
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| EEG frequency band of 4 hertz to less than 8 hertz | show 🗑
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| EEG pattern characterized by theta frequency activity which is monotonous and widespread and shows no response to stimulation in a comatose patient | show 🗑
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| show | TIRDA - temporal intermittent rhythmic delta activity
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| show | transient
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| show | triphasic waves
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| occurring on one side | show 🗑
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| show | V-wave (vertex wave)
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