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from Part II - Interpretation
Published online by Cambridge University Press: 24 June 2021
First identify the foreground abnormality (or activity) based on three key features of Location (generalized, lateralized, bilaterally independent, focal, or multifocal), occurrence (sporadic or repetitive), and morphology (sharp or blunt). Next, qualify your description with the modifiers of prevalence, duration, amplitude, and frequency. Prevalence - abnormalities may be continuous or intermittent, if intermittent; they may be abundant, frequent, occasional or rare. Duration - intermittent abnormalities may be very long, long, intermittent, brief, or of a very brief duration when they occur. These terms are most useful with continuous EEG monitoring. Amplitude - abnormalities may be very low (< 20 uV), low (20-49 uV), medium (50-199 uV), or high (> 200 uV) in amplitude; always measure the absolute amplitude (peak to trough). Frequency - measure the typical rate of the abnormality to the nearest 0.5 per second division. When reporting the waveform, the modifiers (prevalence, duration, amplitude, and frequency) should precede the three key features of location, composition, and morphology.
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