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Figure 1. The electrocardiogram of a 42-year-old woman with the ostium secundum type of atrial septal defect shows normal sinus rhythm with incomplete right bundle-branch block (RBBB), indicated by the rSR' pattern in leads V1 and V2 and the terminal S wave in V6; right atrial enlargement (RAE), indicated by the tall P waves in leads II, III, and aVF; and right ventricular hypertrophy (RVH), indicated by the tall R waves in leads V1 and V2. The chest radiograph of the same patient shows a globular cardiac silhouette with prominent pulmonary arteries (p); cs denotes cardiac silhouette. . . . [Full Text of this Article] |