Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Definitions
| Question | Answer |
|---|---|
| EEG frequency band of 8-13 Hz | alpha |
| EEG pattern characterized by alpha frequency activity whic is monotonous and widespread and shows no response to stimulation in a comatose pt | alpha coma |
| 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 | alpha / theta coma |
| rhythm at 8-13 hz occurring during wakefulness over the posterior regions of the head, generally with higher voltage of the occiptal areas | alpha rhythm |
| the voltage of the EEG waveform or waveform complex measure din mircrovolts | amplitude |
| any waveform in the EEG recording that is not of cerebral origin | artifact |
| EEG activity that is decreased or increased in one hemisphere when compared to the same region in the opposite hemisphere | asymmetry |
| independent or non-simultaneous occurrence in time of EEG waveforms over the two hemispheres | asynchrony |
| reduction of the amplitude of EEG activity resulting from decreased voltage; may be seen on the EEG of a comatose patient during painful stimulation | attenuation |
| the underlying activity of the brain | background activity |
| frequency of the activity seen in the occipital electrodes when the patient is alert | background rhythm or background pattern |
| EEG frequency band of 14 -30 Hz | beta |
| EEG waveforms occurring over both hemispheres | bilateral |
| EEG waveforms that occur at fixed intervals asynchrounsously over both hemispheres | BiPDs - bilateral periodic discharges |
| represents the difference between two EEG scalp electrodes in each channel | bipolar montage |
| EEG waveforms occurring bilaterally at the same time | bisynchronous |
| higher amplitude EEG waveforms seen over a skull defect | breach rhythm |
| 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 | burst |
| and EEG pattern characterized by bursts of theta and / or delta often intermixed with faster frequencies with intervening periods of relative quiescence or flattening. | burst suppression |
| prolonged (hours, days, or weeks), continuously recorded digital EEG in critically ill patients with altered mental status or with a significant risk for acute brain ischemia | cEEG (continuous EEG) |
| arising from the area of the brain around the central sulcus | central |
| a sequence of two or more EEG waveforms with a distinct form or pattern different from the background activity | complex |
| a focal seizure associated with diminished consciousness or responsiveness | complex partial sz |
| any values/interpretations where delays in reporting may result in serious adverse outcomes for patients; also known as: critical values | critical test results |
| any values/interpretations where delays in reporting may result in serious adverse outcomes for patients; also known as: critical test results | critical values |
| EEG frequency band of less than 4 hertz | delta |
| EEG activity that is widespread and occurring over large areas of the head | diffuse |
| any EEG waves that are below 8 hertz that are widespread and occurring over large areas of the head | diffuse slowing |
| the frequency of the EEG activity that occupies the greatest part of the recording | dominant frequency |
| no EEG activity over 2 microvolts when recorded from scalp electrode pairs 10 or more centimeters apart with electrode impedances under 10,000 Ohms. | ECI - electrocerebral inactivity |
| no EEG activity over 2 microvolts when recorded from scalp electrode pairs 10 or more centimeters apart with electrode impedances under 10,000 Ohms | ECS - electrocerebral silence |
| 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. | electrode impedance |
| 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: nonconvulsive seizure | electrographic seizure |
| 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. | epileptic discharges |
| 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 | epileptiform discharges |
| distinctive EEG waves or complexes, distinguished from the background activity, and resembling those recorded in a proportion of human subjects suffering from epileptic disorders, rendered epileptic experimentally. Epileptiform is the preferred term. | epileptic spikes |
| 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. | epileptiform activity |
| any EEG activity that is faster than 13 hertz – beta (13 to 30 Hz) and gamma (30 Hz and above | Fast activity/fast frequencies |
| intermittent, rhythmic trains of delta activity in the frontal regions; is a non-specific finding in adult patients | FIRDA - frontal intermittent rhythmic delta activity |
| 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. | focal |
| how often a changing signal repeats itself. The unit is hertz (Hz) or cycles per second (cps).` | frequency |
| EEG activity that is coming from these electrodes (Fp1, Fp2, F3, F4, F7, F8) | frontal |
| EEG activity that has its highest amplitude in the frontal electrodes. For example: frontally dominant spike and wave activity, frontally dominant delt | frontally dominant |
| EEG frequency band of greater than 30 hertz | gamma |
| EEG waveforms occurring simultaneously in all recording electrodes | generalized |
| EEG waveforms in the theta and/or delta frequency ranges occurring simultaneously in all recording electrodes | generalized slowing |
| spike and wave EEG waveforms occurring simultaneously in all recording electrodes | generalized spike and wave |
| caused by tongue movement; glossokinetic artifacts can be seen on the EEG recording when the patient talks and swallows | glossokinetic |
| 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. | GPEDs - generalized periodic epileptiform discharges |
| the unit of frequency equal to one cycle per second; abbreviated Hz. For example: 8 hertz alpha activity | hertz |
| a non-specific term indicating that the amplitude seen on the EEG is higher than expected; usually greater than 50 microvolts | high amplitude |
| a non-specific term indicating that the voltage seen on the EEG is higher than expected; usually greater than 50 microvolts | high voltage |
| having the same relative position or structure. For example: C3 and C4 are homologous electrodes. | homologous |
| during the seizure | ictal |
| between seizures | interictal |
| 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. | impedance |
| 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. | interictal epileptiform discharges |
| an EEG waveform that has no predictability of cadence/rhythm | irregular |
| a normal component of sleep; sharply contoured, high amplitude EEG waveforms followed by a slower component occurring spontaneously and with stimulation. | k-complex |
| occurring only over one hemisphere | lateralized |
| a non-specific term indicating that the amplitude seen on the EEG is lower than expected; usually less than 20 microvolts | low amplitude |
| a non-specific term indicating that the voltage seen on the EEG is lower than expected; usually less than 20 microvolts | low voltage |
| a non-specific term indicating the frequencies on the EEG are slightly slower than expected | mild slowing |
| EEG waveforms that are composed of delta, theta, alpha, and beta frequencies superimposed on each othe | mixed frequency activity |
| combinations of multiple pairs of electrodes using available channels which allow for simultaneous recording of EEG activity over the entire scalp | montage |
| 7 to 11 Hz arch-shaped waveform seen unilaterally or bilaterally over the central regions, maximal at the C3 and/or C4 electrodes. Mu blocks (attenuates) with movement of the contralateral hand. | mu |
| two or more independent foci are present in the EEG recording electrodes | multi focal |
| 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 | non convulsive seizure |
| 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. | NCSE - non convulsive status epilepticus |
| continuous EEG recording done in real-time with video monitoring and constant observation by an EEG technologist | neurotelemetry |
| EEG waveforms with abrupt onset, rapid attainment of maximum amplitude, and sudden termination that are easily distinguished from the background | paroxysmal |
| theta and delta frequency waveforms with abrupt onset, rapid attainment of maximum amplitude, and sudden termination that are easily distinguished from the background | paroxysmal slowing |
| spike and wave complexes with abrupt onset, rapid attainment of maximum amplitude, and sudden termination that are easily distinguished from the background | paroxysmal spike and wave |
| – EEG pattern characterized by sharp waves or spikes occurring at a regular rate | PEDs - periodic epileptiform discharges |
| EEG waveform or complex of waves that appears at a consistent rate, for example: one every 1 to 4 seconds | periodic |
| EEG patterns that appear at a consistent rate, for example: generalized periodic epileptiform discharges (GPEDs), periodic lateralized epileptiform discharges (PLEDs) | periodic patterns |
| high amplitude, generalized, irregular spike and wave or multiple spike and wave bursts seen during photic stimulation | photoparoxysmal response |
| EEG pattern characterized by sharp waves or spikes occurring at a regular rate; most often seen in acute neurologic conditions, especially cerebral infarctions | PLED's - periodic lateralized epileptiform discharges |
| having multiple shapes; multiple EEG frequencies combine creating complex waveforms | polymorphic |
| a sequence of two or more spikes | polyspikes |
| after a seizure. For example, focal right temporal postictal delta. | post ictal |
| a normal component of sleep seen predominantly in the occipital regions | POSTS - possitive occipital sharp transients of sleep |
| frequency of the activity seen in the occipital electrodes when the patient is alert; also known as background rhythm | PDR - posterior dominant rhythm |
| a distinctive EEG pattern characterized by marked attenuation of all frequencies including delta activity in the ischemic hemisphere | RAWOD - regional attenuation without delta |
| change in the EEG activity following stimulation | reactivity |
| 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 | referential montage |
| EEG activity consisting of waves of a constant frequency. For example: rhythmic 11 hertz alpha activity. | rhythmic |
| generalized discharges arising from a unilateral cortical focus | secondary bilateral synchrony |
| a clinically bilateral tonic-clonic seizure that on EEG starts in a focal area and quickly spreads to all EEG recording electrodes | secondary generalized sz |
| 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. | seizure discharges |
| EEG waveforms with a duration of greater than 70 milliseconds but less than 200 milliseconds. Another term for sharp wave. | sharp transients |
| an EEG waveform with a duration of greater than 70 milliseconds but less than 200 milliseconds | sharp wave |
| a sharp wave followed by a delta wave | sharp wave complex |
| a localized seizure (isolated to a small area of the brain) with no changes in cognition | simple partial seizure |
| 12 to 14 Hz EEG waveforms with maximal amplitude over the central regions seen during sleep | sleep spindles |
| EEG waves that are below 8 hertz – theta (4 to 8 Hz) and delta (less than 4 Hz) | slow activity |
| any EEG waves that are below 8 hertz – theta (4 to 8 Hz) and delta (less than 4 Hz) | slowing |
| EEG waveform with a duration of less than 70 milliseconds but greater than 20 milliseconds | spike |
| EEG waveform consisting of a spike followed by a slow wave. Can be focal, lateralized, or generalized. Sometimes called | spike and wave complex (AKA - spike and wave patterns) |
| EEG waveforms consisting of a spike followed by a slow wave. Can be focal, lateralized, or generalized. | spike and wave discharge |
| 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. | spindle coma |
| used to refer to nonconvulsive seizures during which there are no clinical manifestations, i.e., no jerking movements | subclinical |
| attenuation of EEG waveforms. Can be focal, lateralized, or generalized. | suppression |
| an EEG pattern characterized by bursts of theta and/or delta often intermixed with faster frequencies with intervening periods of relative quiescence or flattening | suppression burs or burst suppression |
| EEG waveforms that are equal in frequency and amplitude over homologous (corresponding) regions of the head | symmetric |
| simultaneous occurrence in time of EEG waveforms over homologous head regions | synchronous |
| EEG frequency band of 4 hertz to less than 8 hertz | theta |
| EEG pattern characterized by theta frequency activity which is monotonous and widespread and shows no response to stimulation in a comatose patient | theta coma |
| intermittent, rhythmic trains of delta activity in either temporal lobe that have been associated with temporal lobe epilepsy | TIRDA - temporal intermittent rhythmic delta activity |
| isolated EEG waves or patterns that are distinctly different from the background | transient |
| EEG waveforms that have 3 phases | triphasic waves |
| occurring on one side | unilateral |
| a normal component of sleep; vertex sharp transient maximal at Cz occurring; may be single or repetitive | V-wave (vertex wave) |
Created by:
LTM
Popular EEG sets