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An Unusual PR Interval Alternans During 2:1 Atrio‐Ventricular Block
Author(s) -
BRAT ALDO,
FRANCHI FRANCO,
PADELETTI LUIGI,
MICHELUCCI ANTONIO,
FANTINI FABIO
Publication year - 1983
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.1983.tb04342.x
Subject(s) - medicine , beat (acoustics) , impulse (physics) , cardiology , rhythm , sinus rhythm , interval (graph theory) , atrial fibrillation , combinatorics , mathematics , physics , acoustics , quantum mechanics
In a case of a 2:1 second degree A‐V block during sinus rhythm, PR intervals of two different durations occur, either separately or alternating beat‐by‐beat. The longer intervals are not caused by concealed conduction in the A‐V junction of the preceding blocked impulses and the shorter ones are not due to supernormal conduction induced by the blocked impulses. This primary PR interval alternans is alternating from a pothophysiological point of view; it only concerns every other impulse alternately traveling along the faster and slower A‐V functional pathway.