Terminology Flashcards

Question

GPD+R

Answer 1

Activity is Generalized (G) Periodic Discharges (PD) Rhythmic (+R)

Answer 2

Generalized (G) Periodic Discharges (PD) Rhthmic (+R) B(I)RD <10 seconds

Answer 3

Activity is Lateralized (L) It is Rhythmic Delta Activity (RDA) No + ( )

Answer 4

a. **Symmetric** b. **Mild asymmetry** (consistent asymmetry in amplitude on referential recording of <50%, or consistent asymmetry in frequency of 0.5 - 1 Hz) c. **Marked asymmetry** (>50% amplitude or >1 Hz frequency asymmetry).

Answer 5

presence, absence, or unclear

Answer 6

a. Specify frequency (to the nearest 0.5 Hz) b. Absence of clear PDA

Answer 7

Delta, Theta, and/or >Alpha. If 2 or 3 frequency bands are equally prominent, record each one.

Answer 8

Present, absent or reverse. ## Footnote An AP gradient is present if at any point in the epoch, there is a clear and persistent (at least 1 continuous minute) anterior to posterior gradient of voltages and frequencies such that lower amplitude, faster frequencies are seen in anterior derivations, and higher amplitude, slower frequencies are seen in posterior derivations. A reverse AP gradient is defined identically but with a posterior to anterior gradient of voltages and frequencies

Answer 9

yes, No, or unknown/unclear/not applicable. | The last choice might apply, for example, in a 30-minute awake record

Answer 10

Yes, No, or Unclear/unknown/not applicable. | Change in cerebral EEG activity to stimulation ## Footnote This may include change in amplitude or frequency, including

Answer 11

a. Normal b. Low (most or all activity <20 μV in longitudinal bipolar with standard 10-20 electrodes, [measured from peak to trough]) c. Suppressed (all activity <10 μV). If discontinuous, this refers to the higher amplitude portion

Answer 12

a. Normal (K-complexes and spindles both present and normal) b. Present (at least one) but abnormal c. Absent (both absent)

Answer 13

a. Continuous. b. Nearly Continuous: continuous, but with occasional (<10% of the record) periods of attenuation or suppression. Describe typical duration of attenuation/suppression as above. i. Nearly continuous with attenuation: periods of lower voltage are >10μV but <50% of the background voltage ii. Nearly continuous with suppression: periods of lower voltage are <10 μV iii. If suppressions/attenuations are stimulus-induced, code as “nearly continuous with SI-attenuation” or “...with SI-suppression” c. Discontinuous: 10-49% of the record consisting of attenuation or suppression, as defined above. d. Burst-attenuation/Burst-suppression: more than 50% of the record consisting of attenuation or suppression, as defined above, with bursts alternating with attenuation or suppression; specify the following: i. Typical duration of bursts and interburst intervals ii. Sharpest component of a typical burst using the sharpness categories defined above under modifiers iii. Presence or absence of Highly Epileptiform Bursts: Present if multiple epileptiform discharges (traditional definition) are present >1/sec, or a rhythmic, potentially ictal-appearing pattern >1 Hz is seen within the majority (>50%) of bursts; record typical frequency (using categories above) and location (G, L, BI or Mf). e. Suppression: entirety of the record consisting of suppression (<10 uV, as defined above) ## Footnote bursts must average more than 0.5 seconds and have at least 4 phases (polyphasic); if shorter or fewer phases, they should be considered single discharges. Bursts within burst-suppression or burst-attenuation can last up to 30 seconds.

Answer 14

defined as total duration of a pattern per 24 hours

Answer 15

defined as Daily Pattern Duration X Mean Frequency (Hz)

Terminology Flashcards

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