Demonstration of intra-atrial conduction delay, block, gap and reentry: a report of two cases.

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Abstract
Intra-atrial reentry, although often suspected to be one of the mechanisms for atrial arrhythmias, is difficult to document in the human heart. The phenomena of intra-atrial conduction delay, block and reentry were observed in 2 patients and led to sustained atrial fibrillation in 1 of the cases. In both cases, the area of conduction delay appeared to be localized in the high right atrium. The electrophysiological findings and the possible mechanisms for the observed phenomena are discussed.