Terminology Flashcards
G
Generalized
BI
Bilateral Independent
Mf
multifocal
PD
Periodic Discharges
SW
Rhythmic Spike and Wave
Rhythmic Sharp and Slow Wave
Rhythmic Polyspike and Wave
RDA
Rhythmic Delta Activity
Modifier +F
superimposed fast activity (PD or RDA only)
Modifier +R
superimposed rhythmic activity (PD only)
Modifier +S
superimposed sharp waves or spikes, sharply contoured (RDA only)
Modifier +FR
both superimposed fast activity and superimposed rhythmic activity (PD only)
Modifier +FS
both superimposed fast activity and superimposed sharp waves, spikes, sharply contoured waves (RDA only)
Generalized - meaning
Widespread throughout EEG
Can have a predominant feature
I.E. Frontally predominant, occipitally predominant, etc
Lateralized - meaning
Unilateral (one side) or Bilateral (both sides)
Specify lobe (i.e. occipital, etc)
Bilateral Independent-meaning
Specify symmetric or asymmetric
Specify which Lobe(s)
occurring on both sides of the brain
Multifocal - meaning
Specify symmetric or asymmetric
Specify which Lobe(s)
emanating from several locations
Periodic Discharges
discharges occurring periodically throughout study
SW
Rhythmic Spike and Wave
Rhythmic Sharp and Slow Wave
Rhythmic Polyspike and Wave
SW
Rhythmic Spike and Wave
Rhythmic Sharp and Slow Wave
Rhythmic Polyspike and Wave
B(I)RD
Commonly written as “BIRDs”
Highly correlate with Ictal activity
Less than 10 seconds in Length (ACNS considers this to “Very Brief” if you’re getting technical)
Classified as:
B Brief
(I) Ictal/Interictal
R Rhythmic
D Discharges
SIRPID
Focal or generalized
Caused by Stimulation to the patient
Patients are typically comatose, stuporous or obtunded
Described as LPD, PD, spike-wave, triphasic
Defined as:
S Stimulus
I Induced
R Rhythmic
P Periodic
I Ictal/interictal
D Discharges
GRDA
Activity is Generalized (G)
It is Rhythmic Delta activity (RDA)
No + ( )
LPD+FR
Activity is Lateralized (L)
It is Periodic (PD)
It has both Superimposed Fast frequencies as well as Rhythmic (+FR)
GSW
Activity is Generalized (G)
It is Rhythmic spike and wave (SW)
No + (does not apply to SW)
BIPD
Bilateral Independent (BI)
Periodic Discharges (PD)
No + ( )
GPD+R
Activity is Generalized (G)
Periodic Discharges (PD)
Rhythmic (+R)
GPD+R
B(I)RD
Generalized (G)
Periodic Discharges (PD)
Rhthmic (+R)
B(I)RD
<10 seconds
LRDA
Activity is Lateralized (L)
It is Rhythmic Delta Activity (RDA)
No + ( )
Symmetry report description
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).
Breach effect report description terms
presence, absence, or unclear
Posterior dominant “alpha” rhythm (PDA) report description
a. Specify frequency (to the nearest 0.5 Hz)
b. Absence of clear PDA
Predominant background EEG frequency report description
Delta, Theta, and/or >Alpha. If 2 or 3 frequency bands are equally prominent, record each one.
Anterior-posterior (AP) gradient
as reported
Present, absent or reverse.
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
Variability
as reported
yes, No, or unknown/unclear/not applicable.
The last choice might apply, for example, in a 30-minute awake record
Reactivity
as reported
Yes, No, or Unclear/unknown/not applicable.
Change in cerebral EEG activity to stimulation
This may include change in amplitude or frequency, including
Voltage
as reported
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
Stage II sleep transients (K-complexes and spindles):
as reported
a. Normal (K-complexes and spindles both present and normal)
b. Present (at least one) but abnormal
c. Absent (both absent)
Continuity
as reported
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)
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.
Daily Pattern Duration
defined as total duration of a pattern per 24 hours
Daily Pattern Index
defined as Daily Pattern Duration X Mean Frequency (Hz)
