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EEG ARTIFACTS DR SRIRAMA ANJANEYULU RESIDENT,NEUROLOGY KING GEORGE HOSPITAL,VIZAG
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.
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
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.
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.