Definitions
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| show | alpha
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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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| show | alpha / theta coma
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| show | alpha rhythm
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| show | amplitude
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| any waveform in the EEG recording that is not of cerebral origin | show 🗑
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| show | asymmetry
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| independent or non-simultaneous occurrence in time of EEG waveforms over the two hemispheres | show 🗑
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| show | attenuation
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| the underlying activity of the brain | show 🗑
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| show | background rhythm or background pattern
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| EEG frequency band of 14 -30 Hz | show 🗑
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| EEG waveforms occurring over both hemispheres | show 🗑
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| show | BiPDs - bilateral periodic discharges
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| show | bipolar montage
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| show | bisynchronous
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| higher amplitude EEG waveforms seen over a skull defect | show 🗑
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| a group of EEG waveforms that appears and disappear abruptly and are distinguished from the background activity by difference in frequency, form, and /or amplitude | show 🗑
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| show | burst suppression
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| show | cEEG (continuous EEG)
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| show | central
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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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| show | delta
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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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| the frequency of the EEG activity that occupies the greatest part of the recording | show 🗑
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| show | ECI - electrocerebral inactivity
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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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| show | epileptic discharges
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| show | epileptiform discharges
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| show | epileptic spikes
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| distinctive EEG 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. | show 🗑
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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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| show | FIRDA - frontal intermittent rhythmic delta activity
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| EEG waveforms seen in a clearly delineated area of the brain usually in a tightly clustered group of electrodes. For example: focal right temporal spike, focal slow wave. | show 🗑
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| show | frequency
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| show | frontal
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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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| EEG frequency band of greater than 30 hertz | show 🗑
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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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| show | GPEDs - generalized periodic epileptiform discharges
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| the unit of frequency equal to one cycle per second; abbreviated Hz. For example: 8 hertz alpha activity | show 🗑
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| a non-specific term indicating that the amplitude seen on the EEG is higher than expected; usually greater than 50 microvolts | show 🗑
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| show | high voltage
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| show | homologous
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| show | ictal
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| between seizures | show 🗑
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| in EEG refers to 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 | interictal epileptiform discharges
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| an EEG waveform that has no predictability of cadence/rhythm | show 🗑
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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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| show | lateralized
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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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| show | mild slowing
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| show | mixed frequency activity
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| combinations of multiple pairs of electrodes using available channels which allow for simultaneous recording of EEG activity over the entire scalp | show 🗑
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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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| continuous, evolving epileptiform activity, such as spikes, sharp waves, rhythmic frequencies, during which the patient has no apparent clinical symptoms. NCSE can be caused by many different entities and can be difficult to diagnose. | show 🗑
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| show | neurotelemetry
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| EEG waveforms with abrupt onset, rapid attainment of maximum amplitude, and sudden termination that are easily distinguished from the background | show 🗑
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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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| – EEG pattern characterized by sharp waves or spikes occurring at a regular rate | show 🗑
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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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| show | periodic patterns
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| show | photoparoxysmal response
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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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| show | POSTS - possitive occipital sharp transients of sleep
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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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| show | reactivity
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| show | referential montage
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| EEG activity consisting of waves of a constant frequency. For example: rhythmic 11 hertz alpha activity. | show 🗑
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| generalized discharges arising from a unilateral cortical focus | show 🗑
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| show | secondary generalized sz
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| show | seizure discharges
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| show | sharp transients
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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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| 12 to 14 Hz EEG waveforms with maximal amplitude over the central regions seen during sleep | show 🗑
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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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| sleep patterns including sleep spindles, vertex sharp waves and/or K-complexes mixed with theta and delta in a patient who is comatose and not arousable. | show 🗑
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| used to refer to nonconvulsive seizures during which there are no clinical manifestations, i.e., no jerking movements | show 🗑
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| attenuation of EEG waveforms. Can be focal, lateralized, or generalized. | show 🗑
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| an 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 | symmetric
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| show | synchronous
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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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| intermittent, rhythmic trains of delta activity in either temporal lobe that have been associated with temporal lobe epilepsy | show 🗑
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| isolated EEG waves or patterns that are distinctly different from the background | show 🗑
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| show | triphasic waves
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| occurring on one side | show 🗑
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| a normal component of sleep; vertex sharp transient maximal at Cz occurring; may be single or repetitive | show 🗑
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