What are the characteristics of the 14-Hz and 6-Hz positive spikes epileptiform normal variant?

Updated: May 11, 2018
  • Author: Selim R Benbadis, MD; Chief Editor: Helmi L Lutsep, MD  more...
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Answer

Answer

The pattern of 14- and 6-Hz positive spikes may be observed at any age, but it is expressed maximally in adolescents, especially those aged 13-14 years. [13] The 6-Hz positive spikes predominate in children younger than 1 year and in adults older than 40 years, and the 14-Hz positive spikes predominate or combine with 6-Hz spikes in the other age groups. [14]

Both 14- and 6-Hz positive spikes are observed predominantly during light sleep. These spikes usually appear in short runs lasting less than 2 seconds, and their frequencies, as the name indicates, are 14 Hz and 6 Hz. The location is mostly posterior temporal, either unilaterally or bilaterally. The morphology is a sharply contoured positive spike alternating with rounded negative component. The amplitude is medium, around 20-60 µV.


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