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. Author manuscript; available in PMC: 2021 Oct 1.
Published in final edited form as: J Clin Neurophysiol. 2021 Jan 1;38(1):1–29. doi: 10.1097/WNP.0000000000000806

FIG. 35.

FIG. 35.

Extreme Delta Brush (EDB). A. This is a subset of +F, with abundant or continuous RDA+F or PDs+F (only if the PDs are blunt delta waves), where the fast activity has a stereotyped relationship to each delta wave. B. Extreme delta brush (EDB): RDA subtype. Examples of RDA that meet criteria for definite and possible EDB (A-C); with an example that does not (D), as the fast activity is part of the background (therefore this pattern does not count as RDA+F). C. Extreme Delta Brush (EDB): PD subtype. Examples of PDs (where the PDs are blunt delta waves) that meet criteria for definite and possible EDB. Example B is not EDB as the +F is not on the delta wave (i.e., it is not delta brushes). Example E is not +F as the fast activity is part of the background, therefore it can not be EDB.