Blocked premature atrial contractions mimicking severe sinus bradycardia

Figures

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  Figure 1. Twelve-lead electrocardiogram at presentation. (A) The tracing appears to show marked sinus bradycardia with 1:1 atrioventricular conduction. (B) Careful inspection reveals a non-conducted premature atrial contraction concealed within the terminal portion of the T wave (red arrow).

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  Figure 2. Catheter ablation of premature atrial contractions. (A) Three-dimensional electroanatomical mapping (CARTO3) demonstrating successful ablation sites (red dots) located in the posterior wall and left lateral wall of the left atrium, anterior ridge of the left pulmonary vein, and lateral wall of the right atrium (left, middle, and right panels, respectively). (B) After successful ablation, sinus rhythm with 1:1 atrioventricular conduction was restored.