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12 Cards in this Set
- Front
- Back
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Describe the Third rhythm (temporal alpha rhythm) and its occurrence.
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Alpha range activity located iin the temporal region.
Occurs in the state. Seen only in some patients who have a skull defect. |
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Describe Mu and its occurrence.
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Negative arch-shaped 7 to 11 Hz rhythmic activity most often located in C3 and C4. Can occur unilaterally and bilaterally often shifting from side to side. Does not attenuate with eye opening.
Occurs in the wake state, attenuated by making a fist with the contralateral hand or moving the contralateral arm. |
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Describe slow alpha variant and its occurrence.
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A sub-harmonic of the posterior
dominant alpha rhythm often notched and occurring at 4.5 to 5 Hz. Occurs in the wake state with eyes closed; attenuates (blocks) with eye opening. |
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Describe fast alpha variant and its occurrence.
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16 to 20 Hz posterior rhythm; can be a harmonic (twice as fast) as the patient's alpha rhythm.
Occurs in the wake state with eyes closed; attenuates (blocks) with eye opening. |
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Describe subclinical rhythmic electrographic discharge of adults (SREDA) and its occurrence.
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Periodic sharp activity located most often in the parietal regions that progresses into a rhythmic theta pattern usually of 5 to 7 Hz.
Occurs in the waking state of older patients; patients have no symptoms or clinical changes associated with the discharge. |
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Describe rhythmic midtemporal theta of drowiness and its occurrence.
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Sharply contoured trains of 4 to 7 Hz theta activity of temporal and central localization; often has a notched appearance.
Occures in a state of drowsiness or relaxed wakefulness. |
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Describe 14 and 6 positive spikes and their occurrence.
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Sharply contoured trains of 14 and 6 Hz spike waves in the posterior region maximal at T5 (P7) and T6 (P8). BEst recorded from widely spaced electrodes so best seen on a referential montage to the contralateral ear.
Occur in a state of drowsiness or stage 1 sleep. |
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Describe positive occipital sharp transients of sleep (POSTS) and their occurrence.
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Positive 4 to 5 Hz theta waves in the occipital regions.
Occurs in stages 1 and 2 of sleep. |
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Describe lambda and its occurrence.
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Positive 4 to 6 Hz theta waves in the occipital regions.
Occurs in the wake state with eyes open with visual input such as reading, scanning an image, etc.; blocked with eye closure. |
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Describe wicket spikes and their occurrence.
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Sharply contoured waves located in the temporal region; seen bilaterally or independently; no slow wave following the sharply contoured wave.
Occur in a state of drowsiness or stage 1 sleep. |
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Describe phantom spike and wave (6Hz spike and wave) and its occurrence.
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Posterior or mid parietal low voltage spike and wave complexes that occur as a single wave or in brief bursts; the spike is very low voltage in comparison with the slow wave.
Occurs with drowsiness. |
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Describe benign sporadic sleep spikes (BSSS), also cal small sharp spikes (SSS) and benign epileptiform transients of sleep (BETS) and their occurrence.
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Low voltage sharp waves that occur on one or both sides in the temporal and frontal regions; may mimic EKG artifact; seen most often on referential montages.
Occur in a Stage 1 to 2 sleep. |
