Vertex waves

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Synonymes: Vertex sharp transient or V wave

  • Maximum at the vertex (like K complex)
  • Amplitude: 50-150 microV
  • Presence in non-REM 1 and to a lesser extent in non-REM 2
  • Narrower and more focal than K complex
  • Unlike K complex vertex waves are not associated with sleep spindles
  • In children and young adult vertex waves could be sharp and in a repetitive run, not to be confused with an epileptic discharge.

Non REM 1 sleep with slow rolling eye movements and vertex wave in a young adult (source) Non REM 1 SREM (source) EEGpedia.png