Interatrial conduction block and retrograde activation of the left atrium and paroxysmal supraventricular tachyarrhythmia

38 patients with heart disease, comprising 16 patients with electrocardiographic evidence of advanced interatrial block and retrograde activation of the left atrium (8 with valvular heart disease, 4 with dilated cardiomyopathy, 4 with other forms) and 22 control patients with similar clinical and echocardiographic characteristics.

Advanced interatrial block and retrograde activation of the left atrium (P ≥ 0.12 s, and diphasic (+/-) P waves in leads II, III, and aVF)

Control group with similar clinical and echocardiographic characteristics but without advanced interatrial block

Incidence of paroxysmal supraventricular tachyarrhythmias during follow-uphard clinical