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Ebstein’s anomaly, but first-degree atrioventricular block occurs in 42% of patients because of right atrial enlargement and structural abnormalities of the atrioventricular conduction system. The atrioventricular node may be compressed and the central fibrous body abnormally formed. The right bundle branch may be abnormal or show marked fibrosis (or both)

*Ebstein’s anomaly - What is the cause of first-degree atrioventricular block ?*

*Great Ormond Street Echocardiography (GOSE) score*