Active vs passive rhythms as an explanation of bigeminal rhythm with similar P waves.

Bayés de Luna, A; Guindo, J; Homs, E; Madoery, C; Lamic, R; Iturralde, P · Chest · 1991

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Abstract

We describe the criteria for differential diagnosis between 3:2 sinoatrial block from atrial bigeminy due to an ectopic focus in the sinus or parasinus zone. In the 3:2 sinoatrial block the RR interval of the basic rhythm is similar to the short R-R interval of the paired rhythm. In atrial bigeminy, the R-R interval of the basic rhythm is similar to the long R-R interval of the paired rhythm.

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