title: Second-degree Wenckebach type AV block due to block within the atrium.
mesh_terms: D000368:Aged; D006328:Cardiac Catheterization; D004562:Electrocardiography; D005260:Female; D006325:Heart Atria; D006327:Heart Block / Q000150:complications / Q000209:etiology*; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D010138:Pacemaker, Artificial; D013614:Tachycardia, Paroxysmal / Q000209:etiology / Q000503:physiopathology