title: Sinus bradycardia and A-V nodal escape with 2:1 retrograde A-V block.
mesh_terms: D000328:Adult; D001146:Arrhythmia, Sinus / Q000503:physiopathology*; D001919:Bradycardia / Q000503:physiopathology; D002037:Bundle-Branch Block / Q000503:physiopathology*; D004562:Electrocardiography; D005260:Female; D006344:Heart Septal Defects, Atrial / Q000503:physiopathology* / Q000601:surgery; D006801:Humans