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Electric Potential in Medicine

Electrocardiogram (EKG)

An electrocardiogram (ECG or EKG, abbreviated from the German Elektrokardiogramm) is a graphic produced by an electrocardiograph, which measures the electrical activity of the heart over time. It measures the potential difference between points on the chest as a function of time.


Chadwick Medical Associates


Electroencephalogram (EEG)

The EEG records brainwave patterns from the continuous tiny electrical signals coming from the brain.

The electrodes are placed on the head. The EEG machine then magnifies the size of these signals, without affecting the brain. The information can be recorded on paper or computer.


Electroretinogram (ERG)

The ERG is a diagnostic test, which involves recording the eye's electrical response to a flash of light by measuring the function of the cells in the retina.