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Article
April 1921

INTERPOLATED CONTRACTIONS OF THE HEART WITH ESPECIAL REFERENCE TO THEIR EFFECT ON THE RADIAL PULSE

Author Affiliations

DES MOINES, IOWA BOSTON

From the Cardiographic Laboratory of the Massachusetts General Hospital.

Arch Intern Med (Chic). 1921;27(4):503-514. doi:10.1001/archinte.1921.00100100119010
Abstract

INTRODUCTION  Attention should be directed to some of the characteristics of interpolated contractions of the heart, particularly as they affect the radial pulse, since at times this type of cardiac irregularity is confusing.An interpolated beat is a premature contraction of the ventricles which is not followed by a compensatory pause and does not disturb the dominant rhythm of the heart. It is impossible for auricular beats to be interpolated, because auricular premature beats are bound to disturb the dominant rhythm. It is also impossible to have interpolated beats in a case of complete auriculoventricular heart block, because here the dominant rhythm is ventricular, and so it, too, would be disturbed. Dresbach and Munford1 state that interpolation in a case of Stokes-Adams' disease was reported by Lichtheim in 1905, but such a phenomenon is very unlikely. Inasmuch as interpolated beats can be no other than ventricular and must be premature,

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