FORMATION OF THE R COMPLEX OF THE ELECTROCARDIOGRAM

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Abstract
The QRS complex of the electrocardiogram results from the algebraic summation of the initial portions of the dextro-and levocardiograms. When the QRS complex is upright, its initial deflection is the upstroke of the dextrocardiogram, while the downstroke is produced by the onset and development of the levocardiogram. When the QRS complex is directed downward, the downstroke is the initial portion of the levocardiogram, while the upstoke is produced by the onset and development of the dextrocardiogram. The amplitude of the QRS complex varies with the interval separating onset of the dextro- and levocardiograms. The maximum amplitude is limited by the amplitude of the component dextro- or levocardiograms.

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