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- W2026779462 abstract "Abstract In atrioventricular rhythm the normal auricular pacemaker is inhibited and there is uncovered a secondary center from which impulses activate the ventricle and, in uncompleted cases, the auricle as well. In certain cases, however, impulses from the secondary center are not conducted to the auricle. In such instances auricular escape occurs, the auricular center of highest automaticity becoming the pacemaker for the auricle. The rhythmicity of such a secondary auricular center is subject to the same influence that may affect other centers of impulse formation. In some cases the retrograde blocking of impulses from the ventricular center is incomplete, and the auricular pacemaker is discharged prematurely by those impulses which reach it just before the completion of its automatic period. Impulses from this pacemaker pass not only to the auricle but also toward the ventricle and produce premature ventricular contractions when not interfered with by refractory tissue. Beating of the ventricle in response to impulses both from the ventricular pacemaker and from the auricular center in such cases constitutes parasystole. Ten cases were studied, three of which are reported in detail. Reciprocal rhythm as an explanation of the records in these cases is considered but evidence against this interpretation is presented. It appears that cases of simple A-V rhythm, of so-called reciprocal rhythm, and of parasystole are fundamentally related; the precise mechanism in a given instance being determined by the state of retrograde conductivity from the ventricular pacemaker. These cases occur under circumstances associated with sinus depression and lowered conductivity. Digitalis in some instances appears to be a contributory factor." @default.
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- W2026779462 date "1932-06-01" @default.
- W2026779462 modified "2023-10-18" @default.
- W2026779462 title "Ventricular bigeminy (parasystole or reciprocal rhythm) in atrioventricular rhythm" @default.
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- W2026779462 doi "https://doi.org/10.1016/s0002-8703(32)90401-3" @default.
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