An unusual PR interval alternans during 2: 1 atrioventricular block

A. Brat, F. Franchi, L. Padeletti, A. Michelucci, F. Fantini

Research output: Contribution to journalArticlepeer-review


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 pathophysiological point of view; it only concerns every other impulse alternately traveling along the faster and slower A-V junctional pathway.

Original languageEnglish
Pages (from-to)161-165
Number of pages5
JournalPACE - Pacing and Clinical Electrophysiology
Issue number2 I
Publication statusPublished - 1983

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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