HICU - Overview of Standardized Critical Care EEG Terminology

Within the ACNS standardized EEG terminology, differentiating between evolving and fluctuating patterns depends on the:

When applying ACNS standardized EEG terminology, how would you classify rhythmic delta activity (RDA) with superimposed sharp waves that appear only in association with the RDA, considering the guidelines for 'plus' modifiers?

In the context of the ACNS standardized EEG terminology, what specific criteria must be satisfied for a pattern to be classified as 'Bilateral Independent' (BI)?

According to the ACNS standardized EEG terminology, which scenario necessitates the use of the term 'lateralized, bilateral, asymmetric'?

Within the American Clinical Neurophysiology Society (ACNS) standardized EEG terminology, how is the 'sharpness' of a waveform defined and categorized, and to which specific waveform types does this modifier apply?

Under the ACNS standardized EEG terminology, how should one classify a pattern characterized by spike, polyspike, or sharp wave components consistently followed by a slow wave, exhibiting a regularly repeating morphology?

How does the ACNS standardized EEG terminology address patterns that fulfill electrographic seizure criteria based on evolution, morphology, or frequency?

According to the ACNS standardized EEG terminology guidelines, when assessing interrater reliability (IRA), which specific EEG features or descriptors have consistently demonstrated 'almost perfect' agreement (kappa = 0.8–1.0) among trained users?

What constitutes 'Quasi-' as a minor modifier for rhythmic or periodic patterns, according to ACNS standardized EEG terminology, and how is it definitively determined?

In the context of the ACNS standardized EEG terminology, how should the prevalence of an EEG pattern be categorized if it occupies 5% of the recorded epoch?

How would one classify generalized spike-wave discharges occurring at a rate of 2.8 Hz according to the ACNS standardized EEG terminology?

According to the ACNS standardized EEG terminology, how would you classify rhythmic or periodic EEG patterns that demonstrate an onset progressing from absent to well-developed within approximately 1.5 seconds?

Under the ACNS standardized EEG terminology, what term describes repeating waveforms or discharges exhibiting relatively uniform morphology and occurring at nearly regular intervals, reminiscent of an EKG pattern?

In the context of ACNS standardized EEG terminology, what implication does the application of a 'plus' modifier (e.g., +F, +R, +S) on periodic discharges (PDs) or rhythmic delta activity (RDA) carry regarding the pattern’s clinical significance?

Within the structure of ACNS standardized EEG terminology, what are the permissible values for determining the 'polarity' of a waveform, and to which waveform types does this modifier specifically apply?

According to ACNS standardized EEG terminology, what is the primary goal behind the transition from terms like 'Generalized Periodic Epileptiform Discharges (GPEDs)' and 'Periodic Lateralized Epileptiform Discharges (PLEDs)' to 'Generalized Periodic Discharges (GPDs)' and 'Lateralized Periodic Discharges (LPDs)'?

According to the ACNS standardized EEG terminology, what is the duration criteria for classifying a pattern as 'long'?

When employing ACNS standardized EEG terminology, If stimulus-induced GPDs with a triphasic morphology that appears following suctioning, how would you classify this pattern?

How does the ACNS standardized EEG terminology define 'absolute amplitude' in the context of periodic discharges (PDs), and what measurement parameters are stipulated?

According to the ACNS standardized EEG terminology, what quantifiable threshold distinguishes 'very low' amplitude discharges?

In the context of the ACNS standardized EEG terminology, if a pattern is observed to last 35 seconds, how would its duration be classified?

When utilizing the ACNS standardized EEG terminology, which condition must be met for any rhythmic or periodic pattern to be included?

According to the ACNS standardized EEG terminology guidelines, how should the location of a pattern be designated if it demonstrates bilateral synchrony but exhibits a restricted field limited to the frontal region?

According to the ACNS standardized EEG terminology, how would one classify a pattern demonstrating spike-wave discharges initially confined to the left temporal region that subsequently spread to involve the entire left hemisphere over a period of 4 minutes?

Within ACNS standardized EEG terminology, how is 'relative amplitude' defined and when is it appropriately utilized?

According to the ACNS standardized EEG terminology, what is the minimum duration that qualifies a specific pattern as 'very long'?

According to ACNS standardized EEG terminology, what is the maximum number of phases a periodic discharge can have?

How does the ACNS standardized EEG terminology define "anterior-posterior lag", and what specific measurement parameter needs to be present?

According to the ACNS standardized EEG terminology, what term is used to describe waveforms with two or three phases, each phase longer than the previous, with the highest amplitude seen in the positive phase?

Within ACNS terminology, which of these electroencephalographic patterns is designed to describe patterns of uncertain significance while specifically excluding patterns that most electroencephalographers would define as definite electrographic seizures?

What characteristic of periodic or rhythmic patterns is defined as having a cycle length varying by 25% to 50% from one cycle to the next in the majority (>50%) of cycle pairs, which can only be determined by quantitative computer analysis?

According to the ACNS standardized EEG terminology, how would you classify a pattern exhibiting sharp contours used for theta or delta waves that are greater than 200 msec but has a steep slope to one side of the wave?

In the context of ACNS standardized EEG terminology, a pattern that is occurring in at least three discrete brain regions and involving both hemispheres can be classified as:

In ACNS standardized EEG terminology, what is the key differentiating factor between 'evolving' and 'fluctuating' patterns, given that both describe patterns changing over time?

In the context of ACNS standardized EEG terminology, what criteria define the classification of amplitude as 'Medium'?

How would one classify periodic discharges that do not apply to bursts which are defined as waveforms that last more than 0.5 second and have at least 4 phases according to the ACNS standardized EEG terminology?

The intervals in between discharges for Periodic Discharges have less than what percent of variation from one cycle to the next?

If an EEG demonstrates a pattern that shifts between generalized rhythmic delta activity (RDA) and lateralized periodic discharges (LPDs) every few minutes, but each pattern persists for at least three cycles, how should this be classified according to ACNS standardized EEG terminology?

A patient's EEG exhibits rhythmic activity at 3 Hz in the left temporal region, with superimposed sharp waves occurring exclusively during the rhythmic bursts with voltage reaching 21 uV. How should one classify this using ACNS standardized EEG terminology?

In the context of ACNS standardized EEG terminology, if generalized periodic discharges (GPDs) transition to exhibiting superimposed rhythmic activity only with the administration of a specific sedative, ceasing immediately upon its discontinuation, how would this be classified?

An EEG epoch is characterized by periodic discharges recurring every 2 seconds, each discharge lasting 300 milliseconds. The amplitude of the discharges varies between 60μV and 180μV. According to ACNS guidelines, how would you classify these discharges?

Under ACNS standardized EEG terminology, how should one classify a rhythmic pattern that demonstrates an initial increase in amplitude over 4 seconds, followed by a plateau lasting 7 seconds, and subsequent abrupt termination?

A patient exhibits bisynchronous periodic discharges with a consistent negative-positive-negative morphology and a cycle length of approximately 3 seconds. However, the duration of the negative phases progressively shortens by 35% with each successive wave, accompanied by a subtle yet discernible alteration in the spatial distribution, how would you classify this?

In the setting of continuous EEG monitoring (cEEG) in the ICU, if after administering a bolus dose of propofol, a patient's EEG transitions from lateralized periodic discharges (LPDs) to generalized periodic discharges (GPDs) with triphasic morphology, how should this be classified according to ACNS standardized EEG terminology?

Under ACNS standardized EEG terminology, what criteria must be met for a pattern displaying rhythmic delta activity with superimposed bursts of beta frequency activity restricted to the same location to be classified as 'Rhythmic Delta Activity + Fast'?

If bilateral, independent periodic discharges (BI-PDs) are observed, predominantly in the temporal regions, with slightly higher amplitude and sharper morphology on the right, how should this be classified using ACNS standardized EEG terminology?

According to ACNS standardized EEG terminology, which specific criteria would prompt the classification of an EEG pattern exhibiting generalized periodic discharges (GPDs) as 'evolving'?

If a patient's EEG demonstrates a pattern of rhythmic activity at 2 Hz over the left hemisphere, initially confined to the temporal region, which over 15 minutes progressively involves the parietal and occipital regions while maintaining consistent morphology and frequency, how should this be classified?

When applying ACNS standardized EEG terminology, how should a pattern characterized by generalized periodic discharges (GPDs) at 1 Hz, with superimposed rhythmic alpha activity (+R) that appears only when the patient is stimulated, and immediately ceases upon cessation of the stimulus be classified?

How should one classify an EEG pattern consisting of rhythmic delta activity (RDA) at 2 Hz in the frontal regions, which abruptly shifts to the occipital regions at the same frequency every 30 seconds, according to ACNS standardized EEG terminology?

A patient exhibits Lateralized Periodic Discharges (LPDs) in the right temporal region at 1 Hz. These discharges occur in distinct bursts, separated by periods of relative quiescence. During the bursts, superimposed on each LPD, there are rhythmic 20 Hz beta oscillations. However, these beta oscillations are also observed independently in the background EEG, not exclusively associated with the LPDs. How should this be classified?

Consistent with ACNS standardized EEG terminology, if a patient's EEG recording demonstrates rhythmic activity at 4 Hz that varies in amplitude between 15μV and 30μV, with the lower amplitude values predominating, how would this be characterized?

According to ACNS standardized EEG terminology, how should a pattern of rhythmic sharp waves be classified if the waveforms have a duration of 85 milliseconds?

Under ACNS standardized EEG terminology, how should an EEG pattern be classified when sharply contoured theta waves ranging 210-240 msec present over the left temporal region, are followed by similar waveforms appearing independently over the right frontal region?

If a patient exhibits lateralized periodic discharges (LPDs) in the right hemisphere that, upon administration of intravenous lorazepam, evolve into generalized periodic discharges (GPDs), how should this sequence be classified according to ACNS guidelines?

According to ACNS standardized EEG terminology, how would you classify a pattern demonstrating sharply contoured rhythmic delta activity (RDA) that initially appears in the frontal regions and then gradually spreads to involve the central and parietal regions bilaterally over 25 minutes?

Under ACNS standardized EEG terminology, how would you define a 'stimulus-induced' pattern?

If a 65-year-old patient's EEG demonstrates rhythmic delta activity (RDA) at 2 Hz superimposed with low-voltage fast activity predominantly in the right hemisphere, but only after tactile stimulation of the left arm and this activity ceases immediately after stopping the stimulation, how should this be classified?

In continuous EEG monitoring, a patient initially demonstrates generalized periodic discharges (GPDs) at 1 Hz. Over the next hour, the frequency gradually increases to 2 Hz, then returns to 1 Hz, followed by an intermittent transition to rhythmic delta activity (RDA) before reverting to the original GPD pattern. How should this be classified?

During continuous EEG monitoring, a patient exhibits generalized periodic discharges (GPDs) with a triphasic morphology. These GPDs initially demonstrate a consistent inter-discharge interval of 2 seconds. Over the course of 30 minutes, the inter-discharge interval varies irregularly between 1.5 and 2.5 seconds, without any other changes in morphology or location. Which ACNS modifier applies?

A patient's EEG demonstrates a consistent pattern of rhythmic delta activity (RDA) in the left temporal region. However, the amplitude of this activity varies spontaneously from 45 μV to 60 μV and occurs approximately every 15 seconds. According to ACNS standardized EEG terminology, how should the amplitude be classified?

Under ACNS standardized EEG terminology, what specific quantitative criterion distinguishes 'quasi-rhythmic' patterns from 'rhythmic' patterns?

How should a set of Periodic Discharges that are bisynchronous and symmetric be classified, wherein the morphology evolves over 5 minutes to include superimposed fast activity in one hemisphere, but returns to baseline after 1 minute?

According to ACNS terminology, what term applies to rhythmic or periodic patterns demonstrating variability in cycle length between 25% and 50%?

While reviewing a series of EEG epochs, you observe a pattern of rhythmic activity that, upon auditory stimulation, becomes more prominent and organized. However, in the absence of stimulation, the pattern is still present, albeit less organized. Which term applies?

In ACNS standardized EEG terminology, if rhythmic sharp waves at 3 Hz are identified over the left temporal region, and these discharges progressively involve the frontal and parietal regions of the same hemisphere over a period of 10 minutes, how should they be classified?

According to ACNS standardized EEG terminology, if a pattern of rhythmic delta activity (RDA) at 2 Hz initially presents in the right frontal region and then, within 6 minutes, shifts to the left temporal region while maintaining similar morphology and frequency, how should this be classified?

Under ACNS standardized EEG terminology, how should one classify generalized periodic discharges (GPDs) that transition to rhythmic delta activity (RDA) and subsequently revert to GPDs within a 3-minute period?

A patient's EEG demonstrates generalized periodic discharges (GPDs) with triphasic morphology. Upon administration of a bolus dose of midazolam, the GPDs are transiently suppressed, replaced by a continuous slowing of the background. As the midazolam effect wanes, the GPDs reappear but now exhibit superimposed rhythmic activity. How should this be characterized?

How should one classify Lateralized Periodic Discharges with superimposed Fast activity (LPD+F) that only appear with photic stimulation?

A patient's EEG exhibits generalized periodic discharges (GPDs) recurring at a frequency of 1 Hz. The amplitude of these discharges varies between 75μV and 150μV. According to ACNS guidelines, how should the amplitude be classified?

When applying ACNS standardized EEG terminology, how does one classify a series of spike-wave discharges where the spike component consistently precedes the slow wave by less than 70 milliseconds?

A patient is being monitored with continuous EEG following a severe traumatic brain injury (TBI). Initial recordings demonstrate Lateralized Periodic Discharges (LPDs) in the left hemisphere. Over the subsequent 24 hours, these LPDs gradually decrease in amplitude and frequency, eventually disappearing altogether, only to be replaced by continuous rhythmic delta activity (RDA) in the same location. How should this be classified?

Per ACNS standardized EEG terminology, what term should be used to describe waveforms exhibiting a duration of 150 milliseconds?