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15 Cards in this Set

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  • Back
Periodic slow complexes
Usually slow complexes or transients (may not always be of high voltage) occuring at approximately regular intervals
Burst surpression activity
Characterized by bursts of slow activity (theta or delta) and/or spikes or sharp waves, with relatively long intervening periods of very low voltage activity
Abnormal Sleep
atypical morphology for a given level of sleep e.g no sleep spindles, or atypical sleep onset such as REM-stage sleep
Alpha Coma
Defined by morphology, location, state of consciousness, and reactivity. Typically the alpha is seen as 9-10 Hz in central-frontal location rather than occipital. It is usually non-reactive.
Spindle Coma
Defined by frequency, morphology, and state of consciousness. Usually 12-14 Hz bursts distributed similarly to sleep spindles and seen in coma, sometimes posttraumatic.
Excessively slow activity (theta and/or delta)
can be intermittent, continuous, focal, or nonfocal
Frontal intermitent rythmical delta activity
Occipital intermittent rythmical delta activity
Electrocerebral inactivity
Profound attenuation (suppression) with no activity greater than 2 uV attributable to cerebral function
rhythmical mid-temporal discharges usually found during drowsiness in temporal theta. It is rare and is uncertain in significance in adults.
SSS or also BETS
Small sharp spikes/Benign epileptiform transients are surface negative fast transients that usually have a voltage between 30-50 uV although it may reach 100 uV. They occur in drowsiness and sleep in the frontal and temporal
Six per second spike and wave activity
small spikes usually no larger than 50 uV followed by a low votage slow wave ranging in the 4-7 Hz with a burst less than a second. Located in either the anterior or posterior regions.
Fourteen and/or 6 Hz Positive Spikes
surface positive spike-like bursts and are in the occipital and posterior temporal regions and found during drowsiness and early sleep. They occur in runs of 14 or 6 Hz or both frequencies mixed.
Rythmic hypersynchronous activity
Rythmic activity emerging from the background and appearing to be nonreactive. May be focal or generalized.
Periodic lateralized epileptiform discharges (PLEDS)
Sharp and slow discharges occuring at an approximately periodic rate usually less than 1 sec