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Cardiac field effects on the EEG

G Dirlich¹, L Vogl, M Plaschke

¹Max Planck Institute of Psychiatry, Clinical Institute, Munich, Germany. dirlich@mpipsykl.mpg.de

Electroencephalography and Clinical Neurophysiology

|April 1, 1997

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The electrical field of the heart creates a significant artifact in scalp recordings during electroencephalography (EEG) averaging. Understanding and removing this electrocardiac artifact is crucial for accurately studying brain potentials coordinated with the heart cycle.

Area of Science:

Neuroscience
Biomedical Engineering
Cardiology

Background:

The heart's electrical field extends throughout the body, influencing scalp potentials.
These cardiac-induced potentials can interfere with electroencephalography (EEG) measurements, particularly during heart cycle-related averaging.
High-amplitude artifacts obscure underlying brain electrical signals.

Purpose of the Study:

To investigate the topographic and temporal characteristics of the electrocardiac artifact in scalp EEG.
To assess the impact of head movements on the cardiac field artifact.
To explore strategies for separating cardiac artifacts from brain potentials.

Main Methods:

Measured scalp potentials and their distribution in 9 healthy subjects.

Related Experiment Videos

Investigated the influence of head-turning on the cardiac electrical field artifact.

Compared scalp potentials with computed vector electrocardiography (ECG) to understand the artifact's 3D nature.

Main Results:

The electrocardiac artifact was most prominent during the QRS complex and T wave of the cardiac cycle.
The artifact exhibited distinct asymmetry between cerebral hemispheres.
The 3D nature of the artifact was confirmed by comparing scalp potentials with vector ECG.

Conclusions:

The cardiac electrical field generates a significant, asymmetrical artifact in scalp EEG.
Head position influences the cardiac field artifact.
Effective separation of cardiac artifacts is essential for studying heart cycle-coordinated brain potentials.