An isoelectric line on the electrocardiograph is the base line on an electrocardiogram.
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isoelectric lines!
Willem Einthoven invented the ECG in 1903. The letters P Q R S T were assigned to the points on the ECG because it was thought that there may be more points in either direction to be found. The letters remained in use out of common practice even after it was determined there were no further points to be labelled.
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The atrial repolarization occurs during the QRS complex of the ECG but is obscured by the ventricle depolarization.
A line of best-fit.