When does a pulse artifact occur on EEG?

Updated: Feb 02, 2017
  • Author: Selim R Benbadis, MD; Chief Editor: Helmi L Lutsep, MD  more...
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Answer

Answer

Pulse artifact occurs when an EEG electrode is placed over a pulsating vessel. The pulsation can cause slow waves that may simulate EEG activity. A direct relationship exists between ECG and the pulse waves. The QRS complex (ie, electrical component of the heart contraction) happens slightly ahead of the pulse waves (200-300 millisecond delay after ECG equals QRS complex).


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