Transient high-degree right bundle branch block masking the type 1 Brugada ECG pattern associated with possible
Andrés Ricardo Pérez-Riera1, Raimundo Barbosa Barros2, Rodrigo Daminello-Raimundo1
1Laboratory of Research and Scientific Writing Methodology, ABC Faculty of Medicine, São Paulo, Brazil.
Abstract:
The Brugada syndrome (BrS) was the last electrocardiographic syndrome described in the 20th century. The initial description included right bundle branch block (RBBB), persistent ST-segment elevation in the right precordial leads, absence of structural heart disease, and propensity to unexplained syncope and/or sudden death mainly during nocturnal rest. Currently, we know that the first three components are not constant or true since RBBB is present in only 28% of cases, the ST-segment elevation is dynamic, at times absent, and there are discrete structural changes in the right ventricular outflow tract. Additionally, the presence of RBBB can hide the typical type 1 Brugada ECG pattern. We present a very unusual case of spontaneous transient RBBB that revealed a hidden type 1 Brugada ECG pattern that could be seen in the beat with normal ventricular conduction.
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