What is the morphology of EEG K complex waves?

Updated: Oct 09, 2019
  • Author: Roy Sucholeiki, MD; Chief Editor: Selim R Benbadis, MD  more...
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Answer

Answer

Example of a K complex. Example of a K complex.

See the list below:

  • K complex waves are large-amplitude delta frequency waves, sometimes with a sharp apex.

  • They can occur throughout the brain and usually are higher in amplitude and more prominent in the bifrontal regions.

  • Usually symmetric, they occur each time the patient is aroused partially from sleep.

  • Semiarousal often follows brief noises; with longer sounds, repeated K complexes can occur.

  • K complexes sometimes are followed by runs of generalized rhythmic theta waves; the whole complex is termed an arousal burst.


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