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EEG artifacts

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BASICS OF EEG ARTIFACTS

BASICS OF EEG ARTIFACTS

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  • 1. EEG ARTIFACTS
    DR SRIRAMA ANJANEYULU
    RESIDENT,NEUROLOGY
    KING GEORGE HOSPITAL,VIZAG
  • 2. Introduction
    Unwanted electrical activity arising from different sources, other than cerebral activity.
    EEG -highly sensitive recording device, easily interrupted by other electrical activity of very high voltages .
    Some readily distinguished, others closely resemble cerebral activity that their interpretation is taxing even to the most experienced eletroencephalographer.
  • 3. CLASSIFICATION
    Physiological : from patient’s own,generator sources other than the brain.
    – Eye movement
    – Muscle ( EMG )
    – Movement
    – Cardiogenic
    – Sweat
    Extraphysiological : Externally generated e.g. instrumental & environmental.
    - IV drip,
    -ventilator
  • 4. Cardiac artifacts
    ECG artifact-poorly formed QRS complex , left temporal leads.(BETS,IED,PLEDS)
    Ballistocardiographic-movement of head or body with cardiac contractions.
    Pacemaker-generalized across scalp , shorter duration.
    Pulse-electrode resting on vessel , frontal and temporal leads , follows ECG artifact.
  • 5. Cardiac artifact
  • 6. Cardiac artifact
  • 7. Pacemaker artifact
  • 8. Pulse artifact
  • 9. ELECTRODE ARTIFACT-TYPES
    Two forms-brief transients limited to one electrode , low frequency rhythms across scalp region.
    Electrode pop-spontaneous discharges.
    Electrode contact-poor contact.
    Electrode/lead movement.
    Perspiration-undulating waves >2 sec.
    Salt bridge-lower amplitude.
    Movement artifact.
  • 10. Electrode pop
  • 11. Electrode Movement artifact
  • 12. Lead movement
  • 13. Sweat artifact
  • 14. Salt bridge artifact
  • 15. EXTERNAL DEVICE ARTIFACT
    50/60 HZ ambient electrical noise
    Intravenous drip
    Electrical devices-intravenous pumps, telephone
    Mechanical artifacts-ventilators,circulator pumps
  • 16. 60 Hz artifact
  • 17. IV drip
  • 18. Electrical motor
  • 19. Mechanical ventilator
  • 20. Circulatory pump
  • 21. MUSCLE ARTIFACT
    Glossokinetic
    Photomyogenic
    Surface EMG
  • 22. Muscle artifact
  • 23. Muscle and movement artifact
  • 24. EMG artifact
  • 25. Photomyogenic artifact
  • 26. OCULAR ARTIFACT
    Blink
    Eye flutter
    Lateral gaze
    Slow/rowing eye movements
    Lateral rectus spike
  • 27. Blink artifact
  • 28. Eye flutter artifact
  • 29. Eye flutter artifact
  • 30. Lateral eye movement
  • 31. Slow roving eye movement
  • 32. Lateral rectus spike
  • 33. Thank you