Related Experiment Video
Updated: Jan 15, 2026

Echocardiographic Evaluation of Atrial Communications before Transcatheter Closure
Published on: February 8, 2022
Transient atypical advanced interatrial block in a pre-adolescent with sequelae of rheumatic fever
Andrés Ricardo Pérez-Riera1, Raimundo Barbosa-Barros2, Maurício da Silva Rocha3
1Internal Medicine, Universidade Nove de Julho (UNINOVE), Mauá, SP, Brazil; Hcor, Sao Paulo, Brazil.
Abstract:
We present a case of a pre-adolescent girl with mitral stenosis caused by rheumatic fever. The 12‑lead ECG showed prolonged P-wave duration indicating interatrial block. In addition, the P waves in the inferior leads showed a transient atypical interatrial block with a triphasic pattern in lead II. The appearance of the atypical interatrial block resulted in the attenuation of the P terminal force in lead V1. Atypical interatrial block is associated with atrial cardiomyopathy and is a potential risk factor for atrial fibrillation or stroke.
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