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.
|Number of pages||5|
|Journal||PACE - Pacing and Clinical Electrophysiology|
|Issue number||2 I|
|Publication status||Published - 1983|
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine